diff --git a/Toolkit.Avalonia/ContentTemplate.cs b/Toolkit.Avalonia/ContentTemplate.cs
index 86a7144..95b753c 100644
--- a/Toolkit.Avalonia/ContentTemplate.cs
+++ b/Toolkit.Avalonia/ContentTemplate.cs
@@ -14,7 +14,7 @@ public class ContentTemplate :
     {
         if (item is IObservableViewModel observableViewModel)
         {
-            if (observableViewModel.ServiceProvider is IServiceProvider provider)
+            if (observableViewModel.Provider is IServiceProvider provider)
             {
                 IContentTemplateDescriptorProvider? contentTemplateProvider = provider.GetService<IContentTemplateDescriptorProvider>();
                 INavigationContext? viewModelContentBinder = provider.GetService<INavigationContext>();
diff --git a/Toolkit.Foundation/Changed.cs b/Toolkit.Foundation/Changed.cs
index 82fd0df..e8a009b 100644
--- a/Toolkit.Foundation/Changed.cs
+++ b/Toolkit.Foundation/Changed.cs
@@ -1,3 +1,10 @@
 namespace Toolkit.Foundation;
 
-public record Changed<TValue>(TValue? Value = default) : INotification;
\ No newline at end of file
+public record Changed<TValue>(TValue? Value = default);
+
+public record Changed
+{
+    public static Changed<TValue> As<TValue>(TValue value) => new(value);
+
+    public static Changed<TValue> As<TValue>() where TValue : new() => new(new TValue());
+}
\ No newline at end of file
diff --git a/Toolkit.Foundation/CommandValueViewModel.cs b/Toolkit.Foundation/CommandValueViewModel.cs
index f2b7717..dd8bbb4 100644
--- a/Toolkit.Foundation/CommandValueViewModel.cs
+++ b/Toolkit.Foundation/CommandValueViewModel.cs
@@ -2,12 +2,13 @@
 
 namespace Toolkit.Foundation;
 
-public partial class CommandValueViewModel<TValue>(IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory,
+public partial class CommandValueViewModel<TValue>(IServiceProvider provider,
+    IServiceFactory factory,
+    IMediator mediator,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer) :
-    ValueViewModel<TValue>(serviceProvider, serviceFactory, publisher, subscriber, disposer)
+    ValueViewModel<TValue>(provider, factory, mediator, publisher, subscriber, disposer)
 {
     public IRelayCommand InvokeCommand =>
         new AsyncRelayCommand(InvokeAsync);
diff --git a/Toolkit.Foundation/CommandViewModel.cs b/Toolkit.Foundation/CommandViewModel.cs
index 740f078..20e3596 100644
--- a/Toolkit.Foundation/CommandViewModel.cs
+++ b/Toolkit.Foundation/CommandViewModel.cs
@@ -2,12 +2,13 @@
 
 namespace Toolkit.Foundation;
 
-public partial class CommandViewModel(IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory,
+public partial class CommandViewModel(IServiceProvider provider,
+    IServiceFactory factory,
+    IMediator mediator,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer) :
-    ObservableViewModel(serviceProvider, serviceFactory, publisher, subscriber, disposer)
+    ObservableViewModel(provider, factory, mediator, publisher, subscriber, disposer)
 {
     public IRelayCommand InvokeCommand => 
         new AsyncRelayCommand(InvokeAsync);
diff --git a/Toolkit.Foundation/ComponentConfigurationViewModel.cs b/Toolkit.Foundation/ComponentConfigurationViewModel.cs
index 4eafe1e..76c09da 100644
--- a/Toolkit.Foundation/ComponentConfigurationViewModel.cs
+++ b/Toolkit.Foundation/ComponentConfigurationViewModel.cs
@@ -8,14 +8,15 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, THe
     INotificationHandler<Changed<TConfiguration>>
     where TConfiguration : class
 {
-    public ComponentConfigurationViewModel(IServiceProvider serviceProvider, 
-        IServiceFactory serviceFactory, 
+    public ComponentConfigurationViewModel(IServiceProvider provider, 
+        IServiceFactory factory,
+        IMediator mediator,
         IPublisher publisher,
         ISubscriber subscriber, 
         IDisposer disposer,
         THeader header,
         TDescription description,
-        TAction action) : base(serviceProvider, serviceFactory, publisher, subscriber, disposer)
+        TAction action) : base(provider, factory, mediator, publisher, subscriber, disposer)
     {
 
     }
@@ -27,8 +28,9 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, THe
     }
 }
 
-public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TAction>(IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory,
+public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TAction>(IServiceProvider provider,
+    IServiceFactory factory,
+    IMediator mediator,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer,
@@ -37,7 +39,7 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TAc
     Func<TConfiguration, TValue> valueDelegate,
     object header,
     object description) :
-    ValueViewModel<TValue>(serviceProvider, serviceFactory, publisher, subscriber, disposer),
+    ValueViewModel<TValue>(provider, factory, mediator, publisher, subscriber, disposer),
     IComponentConfigurationViewModel,
     INotificationHandler<Changed<TConfiguration>>
     where TConfiguration : class
@@ -68,8 +70,9 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TAc
     }
 }
 
-public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TDescription, TAction>(IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory,
+public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TDescription, TAction>(IServiceProvider provider,
+    IServiceFactory factory,
+    IMediator mediator,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer,
@@ -78,7 +81,7 @@ public partial class ComponentConfigurationViewModel<TConfiguration, TValue, TDe
     TConfiguration configuration,
     Func<TConfiguration, TValue> valueDelegate,
     object header) :
-    ValueViewModel<TValue>(serviceProvider, serviceFactory, publisher, subscriber, disposer),
+    ValueViewModel<TValue>(provider, factory, mediator, publisher, subscriber, disposer),
     IComponentConfigurationViewModel,
     INotificationHandler<Changed<TConfiguration>>
     where TConfiguration : class
diff --git a/Toolkit.Foundation/ComponentHost.cs b/Toolkit.Foundation/ComponentHost.cs
index f660820..907a694 100644
--- a/Toolkit.Foundation/ComponentHost.cs
+++ b/Toolkit.Foundation/ComponentHost.cs
@@ -3,7 +3,7 @@ using Microsoft.Extensions.Hosting;
 
 namespace Toolkit.Foundation;
 
-public sealed class ComponentHost(IServiceProvider services,
+public class ComponentHost(IServiceProvider services,
     IEnumerable<IInitializer> initializers,
     IEnumerable<IHostedService> hostedServices) :
     IComponentHost
diff --git a/Toolkit.Foundation/Create.cs b/Toolkit.Foundation/Create.cs
index 45b2bb9..667aa9a 100644
--- a/Toolkit.Foundation/Create.cs
+++ b/Toolkit.Foundation/Create.cs
@@ -1,12 +1,13 @@
 
 namespace Toolkit.Foundation;
 
-public record Create<TValue>(TValue Value) :
-    INotification;
+public record Create<TValue>(TValue Value);
 
 public record Create
 {
-    public static Create<TValue> As<TValue>(TValue value) => new(value);
+    public static Create<TValue> As<TValue>(TValue value) =>
+        new(value);
 
-    public static Create<TValue> As<TValue>() where TValue : new() => new(new TValue());
+    public static Create<TValue> As<TValue>() where TValue : new() => 
+        new(new TValue());
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/Enumerate.cs b/Toolkit.Foundation/Enumerate.cs
index 14d385f..63aebe8 100644
--- a/Toolkit.Foundation/Enumerate.cs
+++ b/Toolkit.Foundation/Enumerate.cs
@@ -1,3 +1,3 @@
 namespace Toolkit.Foundation;
 
-public record Enumerate<TValue>(object? Key = null) : INotification;
\ No newline at end of file
+public record Enumerate<TValue>(object? Key = null);
\ No newline at end of file
diff --git a/Toolkit.Foundation/HandlerDelegate.cs b/Toolkit.Foundation/HandlerDelegate.cs
index 73ce94b..455c50c 100644
--- a/Toolkit.Foundation/HandlerDelegate.cs
+++ b/Toolkit.Foundation/HandlerDelegate.cs
@@ -1,5 +1,4 @@
 namespace Toolkit.Foundation;
 
-public delegate Task<TResponse> HandlerDelegate<TMessage, TResponse>(TMessage message,
-    CancellationToken cancellationToken)
-    where TMessage : IMessage;
\ No newline at end of file
+public delegate Task<TResponse> HandlerDelegate<TRequest, TResponse>(TRequest request,
+    CancellationToken cancellationToken);
\ No newline at end of file
diff --git a/Toolkit.Foundation/HandlerWrapper.cs b/Toolkit.Foundation/HandlerWrapper.cs
index f5ba764..9cc8ae0 100644
--- a/Toolkit.Foundation/HandlerWrapper.cs
+++ b/Toolkit.Foundation/HandlerWrapper.cs
@@ -1,25 +1,25 @@
 namespace Toolkit.Foundation;
 
-public class HandlerWrapper<TMessage, TReply>(IHandler<TMessage, TReply> handler,
-    IEnumerable<IPipelineBehavior<TMessage, TReply>> pipelineBehaviours)
-    where TMessage : class, IRequest<TReply>
+public class HandlerWrapper<TRequest, TResponse>(IHandler<TRequest, TResponse> handler,
+    IEnumerable<IPipelineBehaviour<TRequest, TResponse>> pipelineBehaviours)
+    where TRequest : class
 {
-    private readonly IEnumerable<IPipelineBehavior<TMessage, TReply>> pipelineBehaviours = 
+    private readonly IEnumerable<IPipelineBehaviour<TRequest, TResponse>> pipelineBehaviours = 
         pipelineBehaviours.Reverse();
 
-    public async Task<TReply> Handle(TMessage message, 
+    public async Task<TResponse> Handle(TRequest request, 
         CancellationToken cancellationToken)
     {
-        HandlerDelegate<TMessage, TReply> currentHandler = handler.Handle;
-        foreach (IPipelineBehavior<TMessage, TReply> behavior in pipelineBehaviours)
+        HandlerDelegate<TRequest, TResponse> currentHandler = handler.Handle;
+        foreach (IPipelineBehaviour<TRequest, TResponse> behaviour in pipelineBehaviours)
         {
-            HandlerDelegate<TMessage, TReply> previousHandler = currentHandler;
+            HandlerDelegate<TRequest, TResponse> previousHandler = currentHandler;
             currentHandler = async (args, token) =>
             {
-                return await behavior.Handle(args, previousHandler, token);
+                return await behaviour.Handle(args, previousHandler, token);
             };
         }
 
-        return await currentHandler(message, cancellationToken);
+        return await currentHandler(request, cancellationToken);
     }
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/IHandler.cs b/Toolkit.Foundation/IHandler.cs
index 9bfb4ee..2263715 100644
--- a/Toolkit.Foundation/IHandler.cs
+++ b/Toolkit.Foundation/IHandler.cs
@@ -4,14 +4,10 @@ public interface IHandler;
 
 public interface IHandler<in TRequest, TResponse> :
     IHandler
-    where TRequest :
-    IRequest<TResponse>
 {
     Task<TResponse> Handle(TRequest args,
         CancellationToken cancellationToken);
 }
 
 public interface IHandler<in TRequest> :
-    IHandler<TRequest, Unit>
-    where TRequest :
-    IRequest<Unit>;
\ No newline at end of file
+    IHandler<TRequest, Unit>;
\ No newline at end of file
diff --git a/Toolkit.Foundation/IMediator.cs b/Toolkit.Foundation/IMediator.cs
index 74fcb71..e87d071 100644
--- a/Toolkit.Foundation/IMediator.cs
+++ b/Toolkit.Foundation/IMediator.cs
@@ -2,9 +2,10 @@
 
 public interface IMediator
 {
-    Task<TResponse?> SendAsync<TResponse>(IRequest<TResponse> request,
-        CancellationToken cancellationToken = default);
+    Task<TResponse?> Handle<TRequest, TResponse>(TRequest request,
+        CancellationToken cancellationToken = default)
+        where TRequest : notnull;
 
-    Task<object?> SendAsync(object message, CancellationToken
+    Task<object?> Handle(object request, CancellationToken
         cancellationToken = default);
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/INotification.cs b/Toolkit.Foundation/INotification.cs
deleted file mode 100644
index 1bc2226..0000000
--- a/Toolkit.Foundation/INotification.cs
+++ /dev/null
@@ -1,4 +0,0 @@
-namespace Toolkit.Foundation;
-
-public interface INotification : 
-    IMessage;
\ No newline at end of file
diff --git a/Toolkit.Foundation/INotificationHandler.cs b/Toolkit.Foundation/INotificationHandler.cs
index abe34bd..3da0f29 100644
--- a/Toolkit.Foundation/INotificationHandler.cs
+++ b/Toolkit.Foundation/INotificationHandler.cs
@@ -1,10 +1,8 @@
 namespace Toolkit.Foundation;
 
-public interface INotificationHandler<in TNotification> :
+public interface INotificationHandler<in TMessage> :
     IHandler
-    where TNotification :
-    INotification
 {
-    Task Handle(TNotification args,
+    Task Handle(TMessage args,
         CancellationToken cancellationToken = default);
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/IObservableViewModel.cs b/Toolkit.Foundation/IObservableViewModel.cs
index 7d688f4..333fa16 100644
--- a/Toolkit.Foundation/IObservableViewModel.cs
+++ b/Toolkit.Foundation/IObservableViewModel.cs
@@ -7,7 +7,7 @@ public interface IObservableViewModel :
 
     public IPublisher Publisher { get; }
 
-    public IServiceFactory ServiceFactory { get; }
+    public IServiceFactory Factory { get; }
 
-    public IServiceProvider ServiceProvider { get; }
+    public IServiceProvider Provider { get; }
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/IPipelineBehavior.cs b/Toolkit.Foundation/IPipelineBehavior.cs
index 7bd8b32..9f4999e 100644
--- a/Toolkit.Foundation/IPipelineBehavior.cs
+++ b/Toolkit.Foundation/IPipelineBehavior.cs
@@ -1,17 +1,15 @@
 namespace Toolkit.Foundation;
 
-public interface IPipelineBehavior<TMessage, TResponse>
-    where TMessage : IMessage
+public interface IPipelineBehaviour<TMessage, TResponse>
 {
     Task<TResponse> Handle(TMessage message,
         HandlerDelegate<TMessage, TResponse> next,
         CancellationToken cancellationToken = default);
 }
 
-public interface IPipelineBehavior<TNotification>
-    where TNotification : INotification
+public interface IPipelineBehaviour<TMessage>
 {
-    Task Handle(TNotification notification,
-        NotificationHandlerDelegate<TNotification> next,
+    Task Handle(TMessage message,
+        NotificationHandlerDelegate<TMessage> next,
         CancellationToken cancellationToken = default);
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/IPublisher.cs b/Toolkit.Foundation/IPublisher.cs
index 6289413..4f0feec 100644
--- a/Toolkit.Foundation/IPublisher.cs
+++ b/Toolkit.Foundation/IPublisher.cs
@@ -2,57 +2,44 @@
 
 public interface IPublisher
 {
-    public Task Publish<TNotification>(object key,
+    public Task Publish<TMessage>(object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification,
-        new();
+        where TMessage : new();
 
-    public Task Publish<TNotification>(TNotification notification,
+    public Task Publish<TMessage>(TMessage message,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification;
+        where TMessage : notnull;
 
-    public Task Publish<TNotification>(TNotification notification,
+    public Task Publish<TMessage>(TMessage message,
         object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification;
+        where TMessage : notnull;
 
-    Task PublishUI<TNotification>(TNotification notification,
+    Task PublishUI<TMessage>(TMessage message,
         object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification;
-
-    Task PublishUI<TNotification>(object key,
+        where TMessage : notnull;
+    Task PublishUI<TMessage>(object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification,
-        new();
+        where TMessage : new();
 
-    Task PublishUI<TNotification>(TNotification notification,
+    Task PublishUI<TMessage>(TMessage message,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification;
+        where TMessage : notnull;
 
-    Task PublishUI(object notification,
+    Task PublishUI(object message,
         CancellationToken cancellationToken = default);
 
-    Task Publish(object notification,
+    Task Publish(object message,
         Func<Func<Task>, Task> marshal,
         object? key = null,
         CancellationToken cancellationToken = default);
 
-    Task PublishUIAsync<TNotification>(CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification,
-        new();
+    Task PublishUI<TMessage>(CancellationToken cancellationToken = default)
+        where TMessage : new();
 
-    Task Publish<TNotification>(CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification,
-        new();
+    Task Publish<TMessage>(CancellationToken cancellationToken = default)
+        where TMessage : new();
 
-    public Task Publish(object notification, CancellationToken cancellationToken = default);
+    public Task Publish(object message, CancellationToken cancellationToken = default);
 }
diff --git a/Toolkit.Foundation/IServiceCollectionExtensions.cs b/Toolkit.Foundation/IServiceCollectionExtensions.cs
index e067f42..20eeebb 100644
--- a/Toolkit.Foundation/IServiceCollectionExtensions.cs
+++ b/Toolkit.Foundation/IServiceCollectionExtensions.cs
@@ -178,7 +178,7 @@ public static class IServiceCollectionExtensions
                     services.Add(new ServiceDescriptor(wrapperType, provider =>
                         provider.GetService<IServiceFactory>()?.Create(wrapperType,
                             provider.GetRequiredService(typeof(INotificationHandler<>).MakeGenericType(notificationType)),
-                            provider.GetServices(typeof(IPipelineBehavior<>)
+                            provider.GetServices(typeof(IPipelineBehaviour<>)
                                 .MakeGenericType(notificationType)))!, lifetime));
                 }
 
@@ -197,7 +197,7 @@ public static class IServiceCollectionExtensions
                     services.Add(new ServiceDescriptor(wrapperType, provider =>
                         provider.GetService<IServiceFactory>()?.Create(wrapperType,
                                 provider.GetRequiredService<THandler>(),
-                                provider.GetServices(typeof(IPipelineBehavior<,>)
+                                provider.GetServices(typeof(IPipelineBehaviour<,>)
                                     .MakeGenericType(requestType, responseType)))!, lifetime));
                 }
             }
diff --git a/Toolkit.Foundation/Initialized.cs b/Toolkit.Foundation/Initialized.cs
new file mode 100644
index 0000000..6302662
--- /dev/null
+++ b/Toolkit.Foundation/Initialized.cs
@@ -0,0 +1,10 @@
+namespace Toolkit.Foundation;
+
+public record Initialized<TValue>(TValue Value);
+
+public record Initialized
+{
+    public static Initialized<TValue> As<TValue>(TValue value) => new(value);
+
+    public static Initialized<TValue> As<TValue>() where TValue : new() => new(new TValue());
+}
\ No newline at end of file
diff --git a/Toolkit.Foundation/Insert.cs b/Toolkit.Foundation/Insert.cs
index e97b8eb..a5ac4d7 100644
--- a/Toolkit.Foundation/Insert.cs
+++ b/Toolkit.Foundation/Insert.cs
@@ -1,3 +1,12 @@
 namespace Toolkit.Foundation;
 
-public record Insert<TValue>(int Index, TValue Value) : INotification;
+public record Insert<TValue>(int Index, TValue Value);
+
+public record Insert
+{
+    public static Insert<TValue> As<TValue>(int index, TValue value) =>
+        new(index, value);
+
+    public static Insert<TValue> As<TValue>(int index) where TValue : new() => 
+        new(index, new TValue());
+}
diff --git a/Toolkit.Foundation/Mediator.cs b/Toolkit.Foundation/Mediator.cs
index c710ed3..f6d649d 100644
--- a/Toolkit.Foundation/Mediator.cs
+++ b/Toolkit.Foundation/Mediator.cs
@@ -5,8 +5,9 @@ namespace Toolkit.Foundation;
 public class Mediator(IServiceProvider provider) :
     IMediator
 {
-    public Task<TResponse?> SendAsync<TResponse>(IRequest<TResponse> request,
+    public Task<TResponse?> Handle<TRequest, TResponse>(TRequest request,
         CancellationToken cancellationToken = default)
+        where TRequest : notnull
     {
         Type handlerType = typeof(HandlerWrapper<,>).MakeGenericType(request.GetType(),
             typeof(TResponse));
@@ -23,7 +24,7 @@ public class Mediator(IServiceProvider provider) :
         return Task.FromResult<TResponse?>(default);
     }
 
-    public Task<object?> SendAsync(object message,
+    public Task<object?> Handle(object message,
         CancellationToken cancellationToken = default)
     {
         if (message.GetType().GetInterface(typeof(IRequest<>).Name) is Type requestType &&
diff --git a/Toolkit.Foundation/Move.cs b/Toolkit.Foundation/Move.cs
index f3c66d9..67e4d77 100644
--- a/Toolkit.Foundation/Move.cs
+++ b/Toolkit.Foundation/Move.cs
@@ -1,3 +1,12 @@
 namespace Toolkit.Foundation;
 
-public record Move<TValue>(int Index, TValue Value) : INotification;
\ No newline at end of file
+public record Move<TValue>(int Index, TValue Value);
+
+public record Move
+{
+    public static Move<TValue> As<TValue>(int index, TValue value) =>
+        new(index, value);
+
+    public static Insert<TValue> As<TValue>(int index) where TValue : new() =>
+        new(index, new TValue());
+}
\ No newline at end of file
diff --git a/Toolkit.Foundation/Navigate.cs b/Toolkit.Foundation/Navigate.cs
index 30dce1c..9b889c2 100644
--- a/Toolkit.Foundation/Navigate.cs
+++ b/Toolkit.Foundation/Navigate.cs
@@ -5,12 +5,10 @@ public record Navigate(string Route,
     string? Scope = null, 
     object? Sender = null,
     EventHandler? Navigated = null,
-    object[]? Parameters = null) :
-    INotification;
+    object[]? Parameters = null);
 
 public record Navigate<TNavigation>(object Context, 
     object Template, 
     object Content,
     object? Sender = null,
-    object[]? Parameters = null) :
-    INotification;
\ No newline at end of file
+    object[]? Parameters = null);
\ No newline at end of file
diff --git a/Toolkit.Foundation/NavigateBack.cs b/Toolkit.Foundation/NavigateBack.cs
index 25be518..224de35 100644
--- a/Toolkit.Foundation/NavigateBack.cs
+++ b/Toolkit.Foundation/NavigateBack.cs
@@ -1,7 +1,5 @@
 namespace Toolkit.Foundation;
 
-public record NavigateBack(object? Context = null, string? Scope = null) :
-    INotification;
+public record NavigateBack(object? Context = null, string? Scope = null);
 
-public record NavigateBack<TNavigation>(object? Context) :
-    INotification;
+public record NavigateBack<TNavigation>(object? Context);
diff --git a/Toolkit.Foundation/NavigationChanged.cs b/Toolkit.Foundation/NavigationChanged.cs
index 6545fd0..b6df381 100644
--- a/Toolkit.Foundation/NavigationChanged.cs
+++ b/Toolkit.Foundation/NavigationChanged.cs
@@ -1,4 +1,3 @@
 namespace Toolkit.Foundation;
 
-public record NavigationChanged<TValue>(TValue? Value) : 
-    INotification;
\ No newline at end of file
+public record NavigationChanged<TValue>(TValue? Value);
\ No newline at end of file
diff --git a/Toolkit.Foundation/NavigationScope.cs b/Toolkit.Foundation/NavigationScope.cs
index 374cb41..5748090 100644
--- a/Toolkit.Foundation/NavigationScope.cs
+++ b/Toolkit.Foundation/NavigationScope.cs
@@ -3,8 +3,8 @@
 namespace Toolkit.Foundation;
 
 public class NavigationScope(IPublisher publisher,
-    IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory,
+    IServiceProvider provider,
+    IServiceFactory factory,
     INavigationProvider navigationProvider,
     INavigationContextProvider navigationContextProvider,
     IContentTemplateDescriptorProvider contentTemplateDescriptorProvider) : 
@@ -39,11 +39,11 @@ public class NavigationScope(IPublisher publisher,
                     Enumerable.Empty<object?>(),
                     .. mappedParameters ?? Enumerable.Empty<object?>()];
 
-                if (serviceProvider.GetRequiredKeyedService(descriptor.TemplateType, segment) is object view)
+                if (provider.GetRequiredKeyedService(descriptor.TemplateType, segment) is object view)
                 {
                     if ((parameters is { Length: > 0 }
-                        ? serviceFactory.Create(descriptor.ContentType, parameters)
-                        : serviceProvider.GetRequiredKeyedService(descriptor.ContentType, segment)) is object viewModel)
+                        ? factory.Create(descriptor.ContentType, parameters)
+                        : provider.GetRequiredKeyedService(descriptor.ContentType, segment)) is object viewModel)
                     {
                         if (context is not null)
                         {
diff --git a/Toolkit.Foundation/NotificationHandlerDelegate.cs b/Toolkit.Foundation/NotificationHandlerDelegate.cs
index 2237a3a..01c0dea 100644
--- a/Toolkit.Foundation/NotificationHandlerDelegate.cs
+++ b/Toolkit.Foundation/NotificationHandlerDelegate.cs
@@ -1,5 +1,4 @@
 namespace Toolkit.Foundation;
 
-public delegate Task NotificationHandlerDelegate<TNotification>(TNotification notification,
-    CancellationToken cancellationToken)
-    where TNotification : INotification;
+public delegate Task NotificationHandlerDelegate<TMessage>(TMessage message,
+    CancellationToken cancellationToken);
diff --git a/Toolkit.Foundation/NotificationHandlerWrapper.cs b/Toolkit.Foundation/NotificationHandlerWrapper.cs
index 100165a..91a67c4 100644
--- a/Toolkit.Foundation/NotificationHandlerWrapper.cs
+++ b/Toolkit.Foundation/NotificationHandlerWrapper.cs
@@ -1,25 +1,24 @@
 namespace Toolkit.Foundation;
 
-public class NotificationHandlerWrapper<TNotification>(INotificationHandler<TNotification> handler,
-    IEnumerable<IPipelineBehavior<TNotification>> pipelineBehaviours)
-    where TNotification : INotification
+public class NotificationHandlerWrapper<TMessage>(INotificationHandler<TMessage> handler,
+    IEnumerable<IPipelineBehaviour<TMessage>> pipelineBehaviours)
 {
-    private readonly IEnumerable<IPipelineBehavior<TNotification>> pipelineBehaviours =
+    private readonly IEnumerable<IPipelineBehaviour<TMessage>> pipelineBehaviours =
         pipelineBehaviours.Reverse();
 
-    public async Task Handle(TNotification notification,
+    public async Task Handle(TMessage message,
         CancellationToken cancellationToken)
     {
-        NotificationHandlerDelegate<TNotification> currentHandler = handler.Handle;
-        foreach (IPipelineBehavior<TNotification> behavior in pipelineBehaviours)
+        NotificationHandlerDelegate<TMessage> currentHandler = handler.Handle;
+        foreach (IPipelineBehaviour<TMessage> behaviour in pipelineBehaviours)
         {
-            NotificationHandlerDelegate<TNotification> previousHandler = currentHandler;
+            NotificationHandlerDelegate<TMessage> previousHandler = currentHandler;
             currentHandler = async (args, token) =>
             {
-                await behavior.Handle(args, previousHandler, token);
+                await behaviour.Handle(args, previousHandler, token);
             };
         }
         
-        await currentHandler(notification, cancellationToken);
+        await currentHandler(message, cancellationToken);
     }
 }
diff --git a/Toolkit.Foundation/ObservableCollectionViewModel.cs b/Toolkit.Foundation/ObservableCollectionViewModel.cs
index 81c2712..7ef445d 100644
--- a/Toolkit.Foundation/ObservableCollectionViewModel.cs
+++ b/Toolkit.Foundation/ObservableCollectionViewModel.cs
@@ -30,14 +30,16 @@ public partial class ObservableCollectionViewModel<TViewModel> :
     [ObservableProperty]
     private bool isInitialized;
 
-    public ObservableCollectionViewModel(IServiceProvider serviceProvider,
-        IServiceFactory serviceFactory,
+    public ObservableCollectionViewModel(IServiceProvider provider,
+        IServiceFactory factory,
+        IMediator mediator,
         IPublisher publisher,
         ISubscriber subscriber,
         IDisposer disposer)
     {
-        ServiceProvider = serviceProvider;
-        ServiceFactory = serviceFactory;
+        Provider = provider;
+        Factory = factory;
+        Mediator = mediator;
         Publisher = publisher;
         Disposer = disposer;
 
@@ -46,15 +48,17 @@ public partial class ObservableCollectionViewModel<TViewModel> :
         collection.CollectionChanged += OnCollectionChanged;
     }
 
-    public ObservableCollectionViewModel(IServiceProvider serviceProvider,
-        IServiceFactory serviceFactory,
+    public ObservableCollectionViewModel(IServiceProvider provider,
+        IServiceFactory factory,
+        IMediator mediator,
         IPublisher publisher,
         ISubscriber subscriber,
         IDisposer disposer,
         IEnumerable<TViewModel> items)
     {
-        ServiceProvider = serviceProvider;
-        ServiceFactory = serviceFactory;
+        Provider = provider;
+        Factory = factory;
+        Mediator = mediator;
         Publisher = publisher;
         Disposer = disposer;
 
@@ -72,6 +76,8 @@ public partial class ObservableCollectionViewModel<TViewModel> :
 
     public IDisposer Disposer { get; private set; }
 
+    public IServiceFactory Factory { get; private set; }
+
     bool IList.IsFixedSize => false;
 
     bool ICollection<TViewModel>.IsReadOnly => false;
@@ -80,12 +86,12 @@ public partial class ObservableCollectionViewModel<TViewModel> :
 
     bool ICollection.IsSynchronized => false;
 
+    public IMediator Mediator { get; }
+
+    public IServiceProvider Provider { get; private set; }
+
     public IPublisher Publisher { get; private set; }
 
-    public IServiceFactory ServiceFactory { get; private set; }
-
-    public IServiceProvider ServiceProvider { get; private set; }
-
     object ICollection.SyncRoot => this;
 
     public TViewModel this[int index]
@@ -119,7 +125,7 @@ public partial class ObservableCollectionViewModel<TViewModel> :
 
     public TViewModel Add()
     {
-        TViewModel? item = ServiceFactory.Create<TViewModel>();
+        TViewModel? item = Factory.Create<TViewModel>();
 
         Add(item);
         return item;
@@ -128,7 +134,7 @@ public partial class ObservableCollectionViewModel<TViewModel> :
     public TViewModel Add<T>(params object?[] parameters)
         where T : TViewModel
     {
-        T? item = ServiceFactory.Create<T>(parameters);
+        T? item = Factory.Create<T>(parameters);
         Add(item);
 
         return item;
@@ -138,7 +144,7 @@ public partial class ObservableCollectionViewModel<TViewModel> :
         where T :
         TViewModel
     {
-        T? item = ServiceFactory.Create<T>();
+        T? item = Factory.Create<T>();
         Add(item);
 
         return item;
@@ -407,9 +413,10 @@ public partial class ObservableCollectionViewModel<TViewModel> :
         CollectionChanged?.Invoke(this, args);
 }
 
-public class ObservableCollectionViewModel(IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory, 
+public class ObservableCollectionViewModel(IServiceProvider provider,
+    IServiceFactory factory, 
+    IMediator mediator,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer) :
-    ObservableCollectionViewModel<IDisposable>(serviceProvider, serviceFactory, publisher, subscriber, disposer);
\ No newline at end of file
+    ObservableCollectionViewModel<IDisposable>(provider, factory, mediator, publisher, subscriber, disposer);
\ No newline at end of file
diff --git a/Toolkit.Foundation/ObservableViewModel.cs b/Toolkit.Foundation/ObservableViewModel.cs
index 2f73260..87f0ec8 100644
--- a/Toolkit.Foundation/ObservableViewModel.cs
+++ b/Toolkit.Foundation/ObservableViewModel.cs
@@ -14,14 +14,16 @@ public  partial class ObservableViewModel :
     [ObservableProperty]
     private bool isInitialized;
 
-    public ObservableViewModel(IServiceProvider serviceProvider,
-        IServiceFactory serviceFactory,
+    public ObservableViewModel(IServiceProvider provider,
+        IServiceFactory factory,
+        IMediator mediator,
         IPublisher publisher,
         ISubscriber subscriber,
         IDisposer disposer)
     {
-        ServiceProvider = serviceProvider;
-        ServiceFactory = serviceFactory;
+        Provider = provider;
+        Factory = factory;
+        Mediator = mediator;
         Publisher = publisher;
         Disposer = disposer;
 
@@ -32,12 +34,14 @@ public  partial class ObservableViewModel :
 
     public IDisposer Disposer { get; }
 
+    public IServiceFactory Factory { get; }
+
+    public IMediator Mediator { get; }
+
+    public IServiceProvider Provider { get; }
+
     public IPublisher Publisher { get; }
 
-    public IServiceFactory ServiceFactory { get; }
-
-    public IServiceProvider ServiceProvider { get; }
-
     public virtual Task Activated() =>
         Task.CompletedTask;
 
diff --git a/Toolkit.Foundation/Publisher.cs b/Toolkit.Foundation/Publisher.cs
index 12622bc..172608c 100644
--- a/Toolkit.Foundation/Publisher.cs
+++ b/Toolkit.Foundation/Publisher.cs
@@ -8,32 +8,31 @@ public class Publisher(ISubscriptionManager subscriptionManager,
     IDispatcher dispatcher) : 
     IPublisher
 {
-    public Task Publish<TNotification>(object key,
+    public Task Publish<TMessage>(object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification,
-        new() => Publish(new TNotification(), async args => await args(),
+        where TMessage : new() => 
+            Publish(new TMessage(), async args => await args(),
                 key, cancellationToken);
 
-    public Task Publish<TNotification>(TNotification notification,
+    public Task Publish<TMessage>(TMessage message,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification => Publish(notification, async args => await args(),
+        where TMessage : notnull => 
+            Publish(message, async args => await args(),
                 null, cancellationToken);
 
-    public Task Publish<TNotification>(TNotification notification,
+    public Task Publish<TMessage>(TMessage message,
         object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification => Publish(notification, 
-            async args => await args(), key, cancellationToken);
+        where TMessage : notnull =>
+            Publish(message, async args => await args(), 
+                key, cancellationToken);
 
-    public async Task Publish(object notification,
+    public async Task Publish(object message,
         Func<Func<Task>, Task> marshal,
         object? key = null,
         CancellationToken cancellationToken = default)
     {
-        Type notificationType = notification.GetType();
+        Type notificationType = message.GetType();
 
         List<object?> handlers = provider.GetServices(typeof(NotificationHandlerWrapper<>)
             .MakeGenericType(notificationType)).ToList();
@@ -55,52 +54,47 @@ public class Publisher(ISubscriptionManager subscriptionManager,
                 if (handleMethod is not null)
                 {
                     await marshal(() => (Task)handleMethod.Invoke(handler, new object[]
-                        { notification, cancellationToken })!);
+                        { message, cancellationToken })!);
                 }
             }
         }
     }
 
-    public Task Publish(object notification,
-        CancellationToken cancellationToken = default) => Publish(notification,
+    public Task Publish(object message,
+        CancellationToken cancellationToken = default) => Publish(message,
             async args => await args(),
                 null, cancellationToken);
 
-    public Task Publish<TNotification>(CancellationToken cancellationToken = default) 
-        where TNotification : 
-        INotification, new() => Publish(new TNotification(),
-            async args => await args(),
+    public Task Publish<TMessage>(CancellationToken cancellationToken = default) 
+        where TMessage :  new() => 
+            Publish(new TMessage(), async args => await args(),
                 null, cancellationToken);
 
-    public Task PublishUI<TNotification>(object key,
+    public Task PublishUI<TMessage>(object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification, new() => Publish(new TNotification(), 
-            args =>  dispatcher.InvokeAsync(async () => await args()),
+        where TMessage : new() => 
+            Publish(new TMessage(), args =>  dispatcher.InvokeAsync(async () => await args()),
                 key, cancellationToken);
 
-    public Task PublishUI<TNotification>(TNotification notification,
+    public Task PublishUI<TMessage>(TMessage message,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification => Publish(notification, 
-            args => dispatcher.InvokeAsync(async () => await args()),
+        where TMessage : notnull => 
+            Publish(message, args => dispatcher.InvokeAsync(async () => await args()),
                 null, cancellationToken);
 
-    public Task PublishUI<TNotification>(TNotification notification,
+    public Task PublishUI<TMessage>(TMessage message,
         object key,
         CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification => Publish(notification, 
-            args => dispatcher.InvokeAsync(async () => await args()),
+        where TMessage : notnull => 
+            Publish(message, args => dispatcher.InvokeAsync(async () => await args()),
                 key, cancellationToken);
-    public Task PublishUIAsync<TNotification>(CancellationToken cancellationToken = default)
-        where TNotification :
-        INotification, new() => Publish(new TNotification(), 
-            args => dispatcher.InvokeAsync(async () => await args()),
+    public Task PublishUI<TMessage>(CancellationToken cancellationToken = default)
+        where TMessage : new() => 
+            Publish(new TMessage(), args => dispatcher.InvokeAsync(async () => await args()),
                 null, cancellationToken);
 
-    public Task PublishUI(object notification,
-        CancellationToken cancellationToken = default) => Publish(notification, args =>
+    public Task PublishUI(object message,
+        CancellationToken cancellationToken = default) => Publish(message, args =>
             dispatcher.InvokeAsync(async () => await args()),
                 null, cancellationToken);
 }
diff --git a/Toolkit.Foundation/Remove.cs b/Toolkit.Foundation/Remove.cs
index 54d190d..4b63bd7 100644
--- a/Toolkit.Foundation/Remove.cs
+++ b/Toolkit.Foundation/Remove.cs
@@ -1,5 +1,13 @@
 
 namespace Toolkit.Foundation;
 
-public record Remove<TValue>(TValue Value) : 
-    INotification;
\ No newline at end of file
+public record Remove<TValue>(TValue Value);
+
+public record Remove
+{
+    public static Remove<TValue> As<TValue>(TValue value) =>
+        new(value);
+
+    public static Remove<TValue> As<TValue>() where TValue : new() =>
+        new(new TValue());
+}
\ No newline at end of file
diff --git a/Toolkit.Foundation/Replace.cs b/Toolkit.Foundation/Replace.cs
index 6441149..919c49e 100644
--- a/Toolkit.Foundation/Replace.cs
+++ b/Toolkit.Foundation/Replace.cs
@@ -1,6 +1,13 @@
 
 namespace Toolkit.Foundation;
 
-public record Replace<TValue>(int Index, TValue Value, object? Target = null) :
-    INotification;
+public record Replace<TValue>(int Index, TValue Value);
 
+public record Replace
+{
+    public static Replace<TValue> As<TValue>(int index, TValue value) =>
+        new(index, value);
+
+    public static Replace<TValue> As<TValue>(int index) where TValue : new() =>
+        new(index, new TValue());
+}
\ No newline at end of file
diff --git a/Toolkit.Foundation/Request.cs b/Toolkit.Foundation/Request.cs
index a5d5fb7..c7f50b9 100644
--- a/Toolkit.Foundation/Request.cs
+++ b/Toolkit.Foundation/Request.cs
@@ -1,12 +1,8 @@
 namespace Toolkit.Foundation;
 
-public record Request<TValue> : 
-    INotification
-{
-
-}
+public record Request<TValue>;
 
 public class Request
 {
-    public static Request<TValue> Create<TValue>() => new();
+    public static Request<TValue> As<TValue>() => new();
 }
\ No newline at end of file
diff --git a/Toolkit.Foundation/Response.cs b/Toolkit.Foundation/Response.cs
index f1a7248..8197b75 100644
--- a/Toolkit.Foundation/Response.cs
+++ b/Toolkit.Foundation/Response.cs
@@ -1,4 +1,3 @@
 namespace Toolkit.Foundation;
 
-public record Response<TValue>(TValue Value) :
-    INotification;
\ No newline at end of file
+public record Response<TValue>(TValue Value);
\ No newline at end of file
diff --git a/Toolkit.Foundation/ServiceScopeFactory.cs b/Toolkit.Foundation/ServiceScopeFactory.cs
index e8b114e..c86aec1 100644
--- a/Toolkit.Foundation/ServiceScopeFactory.cs
+++ b/Toolkit.Foundation/ServiceScopeFactory.cs
@@ -11,9 +11,9 @@ public class ServiceScopeFactory<TService>(IServiceScopeFactory serviceScopeFact
     {
         if (serviceScopeFactory.CreateScope() is IServiceScope serviceScope)
         {
-            if (serviceScope.ServiceProvider.GetService<IServiceFactory>() is IServiceFactory serviceFactory)
+            if (serviceScope.ServiceProvider.GetService<IServiceFactory>() is IServiceFactory factory)
             {
-                if (serviceFactory.Create<TService>(parameters) is TService service)
+                if (factory.Create<TService>(parameters) is TService service)
                 {
                     cache.Add(service, serviceScope);
                     return service;
diff --git a/Toolkit.Foundation/Started.cs b/Toolkit.Foundation/Started.cs
index 9180311..3df6262 100644
--- a/Toolkit.Foundation/Started.cs
+++ b/Toolkit.Foundation/Started.cs
@@ -1,4 +1,3 @@
 namespace Toolkit.Foundation;
 
-public record Started : 
-    INotification;
\ No newline at end of file
+public record Started;
\ No newline at end of file
diff --git a/Toolkit.Foundation/ValueViewModel.cs b/Toolkit.Foundation/ValueViewModel.cs
index da03c02..a43ba96 100644
--- a/Toolkit.Foundation/ValueViewModel.cs
+++ b/Toolkit.Foundation/ValueViewModel.cs
@@ -2,12 +2,13 @@
 
 namespace Toolkit.Foundation;
 
-public partial class ValueViewModel<TValue>(IServiceProvider serviceProvider,
-    IServiceFactory serviceFactory,
+public partial class ValueViewModel<TValue>(IServiceProvider provider,
+    IServiceFactory factory,
+    IMediator mediator,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer) :
-    ObservableViewModel(serviceProvider, serviceFactory, publisher, subscriber, disposer)
+    ObservableViewModel(provider, factory, mediator, publisher, subscriber, disposer)
 {
     [ObservableProperty]
     private TValue? value;
diff --git a/Toolkit.UI.Controls.Avalonia/Themes/ThemeResources.axaml.cs b/Toolkit.UI.Controls.Avalonia/Themes/ThemeResources.axaml.cs
index 0f3df7f..6989d3e 100644
--- a/Toolkit.UI.Controls.Avalonia/Themes/ThemeResources.axaml.cs
+++ b/Toolkit.UI.Controls.Avalonia/Themes/ThemeResources.axaml.cs
@@ -6,8 +6,8 @@ namespace Toolkit.UI.Controls.Avalonia;
 public class ThemeResources :
     Styles
 {
-    public ThemeResources(IServiceProvider? serviceProvider = null)
+    public ThemeResources(IServiceProvider? provider = null)
     {
-        AvaloniaXamlLoader.Load(serviceProvider, this);
+        AvaloniaXamlLoader.Load(provider, this);
     }
 }