Index: Core/Common/src/Core.Common.Base/Observable.cs
===================================================================
diff -u -rad04a3f7bc413808f2d8b8f7ac60270e794dd133 -rcf4f947febf6a8d92379094230ca4bade46a87d0
--- Core/Common/src/Core.Common.Base/Observable.cs	(.../Observable.cs)	(revision ad04a3f7bc413808f2d8b8f7ac60270e794dd133)
+++ Core/Common/src/Core.Common.Base/Observable.cs	(.../Observable.cs)	(revision cf4f947febf6a8d92379094230ca4bade46a87d0)
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 
 namespace Core.Common.Base
@@ -8,7 +9,7 @@
     /// </summary>
     public abstract class Observable : IObservable
     {
-        private readonly IList<IObserver> observers = new List<IObserver>();
+        private readonly ICollection<IObserver> observers = new Collection<IObserver>();
 
         public void Attach(IObserver observer)
         {
Index: Core/Common/src/Core.Common.Base/ObservableList.cs
===================================================================
diff -u -rad04a3f7bc413808f2d8b8f7ac60270e794dd133 -rcf4f947febf6a8d92379094230ca4bade46a87d0
--- Core/Common/src/Core.Common.Base/ObservableList.cs	(.../ObservableList.cs)	(revision ad04a3f7bc413808f2d8b8f7ac60270e794dd133)
+++ Core/Common/src/Core.Common.Base/ObservableList.cs	(.../ObservableList.cs)	(revision cf4f947febf6a8d92379094230ca4bade46a87d0)
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 
 namespace Core.Common.Base
@@ -9,7 +10,7 @@
     /// <typeparam name="T">The type of elements in the list.</typeparam>
     public class ObservableList<T> : List<T>, IObservable
     {
-        private readonly IList<IObserver> observers = new List<IObserver>();
+        private readonly ICollection<IObserver> observers = new Collection<IObserver>();
 
         public void Attach(IObserver observer)
         {
Index: Core/Common/src/Core.Common.Base/Plugin/ApplicationCore.cs
===================================================================
diff -u -rad04a3f7bc413808f2d8b8f7ac60270e794dd133 -rcf4f947febf6a8d92379094230ca4bade46a87d0
--- Core/Common/src/Core.Common.Base/Plugin/ApplicationCore.cs	(.../ApplicationCore.cs)	(revision ad04a3f7bc413808f2d8b8f7ac60270e794dd133)
+++ Core/Common/src/Core.Common.Base/Plugin/ApplicationCore.cs	(.../ApplicationCore.cs)	(revision cf4f947febf6a8d92379094230ca4bade46a87d0)
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using Core.Common.Base.IO;
 using Core.Common.Utils.Reflection;
@@ -11,14 +12,14 @@
     /// </summary>
     public class ApplicationCore : IDisposable
     {
-        private readonly List<ApplicationPlugin> plugins;
+        private readonly ICollection<ApplicationPlugin> plugins;
 
         /// <summary>
         /// Constructs a new <see cref="ApplicationCore"/>.
         /// </summary>
         public ApplicationCore()
         {
-            plugins = new List<ApplicationPlugin>();
+            plugins = new Collection<ApplicationPlugin>();
         }
 
         /// <summary>
Index: Core/Common/src/Core.Common.Base/Properties/Resources.Designer.cs
===================================================================
diff -u -rd10ce32a6631b4b73ca5d87f51cf16fa2ee5f1c0 -rcf4f947febf6a8d92379094230ca4bade46a87d0
--- Core/Common/src/Core.Common.Base/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision d10ce32a6631b4b73ca5d87f51cf16fa2ee5f1c0)
+++ Core/Common/src/Core.Common.Base/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision cf4f947febf6a8d92379094230ca4bade46a87d0)
@@ -61,29 +61,29 @@
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Uitvoeren van &apos;{0}&apos; is mislukt..
+        ///   Looks up a localized string similar to Uitvoeren van &apos;{0}&apos; is geannuleerd..
         /// </summary>
-        internal static string Activity_Finish_Execution_of_0_has_failed {
+        internal static string Activity_Finish_Execution_of_ActivityName_0_has_been_cancelled {
             get {
-                return ResourceManager.GetString("Activity_Finish_Execution_of_0_has_failed", resourceCulture);
+                return ResourceManager.GetString("Activity_Finish_Execution_of_ActivityName_0_has_been_cancelled", resourceCulture);
             }
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Uitvoeren van &apos;{0}&apos; is gelukt..
+        ///   Looks up a localized string similar to Uitvoeren van &apos;{0}&apos; is mislukt..
         /// </summary>
-        internal static string Activity_Finish_Execution_of_0_has_succeeded {
+        internal static string Activity_Finish_Execution_of_ActivityName_0_has_failed {
             get {
-                return ResourceManager.GetString("Activity_Finish_Execution_of_0_has_succeeded", resourceCulture);
+                return ResourceManager.GetString("Activity_Finish_Execution_of_ActivityName_0_has_failed", resourceCulture);
             }
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Uitvoeren van &apos;{0}&apos; is geannuleerd..
+        ///   Looks up a localized string similar to Uitvoeren van &apos;{0}&apos; is gelukt..
         /// </summary>
-        internal static string Activity_Run_Execution_of_0_has_been_cancelled {
+        internal static string Activity_Finish_Execution_of_ActivityName_0_has_succeeded {
             get {
-                return ResourceManager.GetString("Activity_Run_Execution_of_0_has_been_cancelled", resourceCulture);
+                return ResourceManager.GetString("Activity_Finish_Execution_of_ActivityName_0_has_succeeded", resourceCulture);
             }
         }
         
Index: Core/Common/src/Core.Common.Base/Properties/Resources.resx
===================================================================
diff -u -rd10ce32a6631b4b73ca5d87f51cf16fa2ee5f1c0 -rcf4f947febf6a8d92379094230ca4bade46a87d0
--- Core/Common/src/Core.Common.Base/Properties/Resources.resx	(.../Resources.resx)	(revision d10ce32a6631b4b73ca5d87f51cf16fa2ee5f1c0)
+++ Core/Common/src/Core.Common.Base/Properties/Resources.resx	(.../Resources.resx)	(revision cf4f947febf6a8d92379094230ca4bade46a87d0)
@@ -117,13 +117,13 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
-  <data name="Activity_Run_Execution_of_0_has_been_cancelled" xml:space="preserve">
+  <data name="Activity_Finish_Execution_of_ActivityName_0_has_been_cancelled" xml:space="preserve">
     <value>Uitvoeren van '{0}' is geannuleerd.</value>
   </data>
-  <data name="Activity_Finish_Execution_of_0_has_succeeded" xml:space="preserve">
+  <data name="Activity_Finish_Execution_of_ActivityName_0_has_succeeded" xml:space="preserve">
     <value>Uitvoeren van '{0}' is gelukt.</value>
   </data>
-  <data name="Activity_Finish_Execution_of_0_has_failed" xml:space="preserve">
+  <data name="Activity_Finish_Execution_of_ActivityName_0_has_failed" xml:space="preserve">
     <value>Uitvoeren van '{0}' is mislukt.</value>
   </data>
   <data name="FileImportActivity_ImportFromFile_Step_CurrentProgress_0_of_TotalProgress_1__|__ProgressText_2" xml:space="preserve">
Index: Core/Common/src/Core.Common.Base/Service/Activity.cs
===================================================================
diff -u -r5914abad7fec8a4bf5634acaf15571b7c195f677 -rcf4f947febf6a8d92379094230ca4bade46a87d0
--- Core/Common/src/Core.Common.Base/Service/Activity.cs	(.../Activity.cs)	(revision 5914abad7fec8a4bf5634acaf15571b7c195f677)
+++ Core/Common/src/Core.Common.Base/Service/Activity.cs	(.../Activity.cs)	(revision cf4f947febf6a8d92379094230ca4bade46a87d0)
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using Core.Common.Base.Properties;
 using log4net;
 
@@ -16,7 +17,7 @@
     public abstract class Activity
     {
         /// <summary>
-        /// Event handler for notifying progress changes.
+        /// Event for notifying progress changes.
         /// </summary>
         public event EventHandler ProgressChanged;
 
@@ -30,7 +31,7 @@
         protected Activity()
         {
             State = ActivityState.None;
-            LogMessages = new List<string>();
+            LogMessages = new Collection<string>();
         }
 
         /// <summary>
@@ -62,12 +63,12 @@
         }
 
         /// <summary>
-        /// Gets or sets the collection of log messages of the <see cref="Activity"/> (which can be appended while performing the <see cref="Activity"/>).
+        /// Gets or sets the collection of log messages of the <see cref="Activity"/> (which are appended while performing the <see cref="Activity"/>).
         /// </summary>
         /// <remarks>
         /// Derived classes themselves are responsible for clearing the collection of log messages.
         /// </remarks>
-        public IList<string> LogMessages { get; private set; }
+        public ICollection<string> LogMessages { get; private set; }
 
         /// <summary>
         /// This method resets <see cref="State"/> to <see cref="ActivityState.None"/> and then runs the <see cref="Activity"/>.
@@ -103,17 +104,17 @@
 
             if (State == ActivityState.Finished)
             {
-                log.InfoFormat(Resources.Activity_Finish_Execution_of_0_has_succeeded, Name);
+                log.InfoFormat(Resources.Activity_Finish_Execution_of_ActivityName_0_has_succeeded, Name);
             }
 
             if (State == ActivityState.Cancelled)
             {
-                log.WarnFormat(Resources.Activity_Run_Execution_of_0_has_been_cancelled, Name);
+                log.WarnFormat(Resources.Activity_Finish_Execution_of_ActivityName_0_has_been_cancelled, Name);
             }
 
             if (State == ActivityState.Failed)
             {
-                log.ErrorFormat(Resources.Activity_Finish_Execution_of_0_has_failed, Name);
+                log.ErrorFormat(Resources.Activity_Finish_Execution_of_ActivityName_0_has_failed, Name);
             }
         }