diff --git a/Source/OmniXaml/ObjectAssembler/Command.cs b/Source/OmniXaml/ObjectAssembler/Command.cs
index f2b28b1..9deb2a3 100644
--- a/Source/OmniXaml/ObjectAssembler/Command.cs
+++ b/Source/OmniXaml/ObjectAssembler/Command.cs
@@ -2,14 +2,13 @@ namespace OmniXaml.ObjectAssembler
 {
     public abstract class Command
     {
-        protected Command(ObjectAssembler assembler)
+        protected Command(StateCommuter stateCommuter)
         {
-            Assembler = assembler;
+            StateCommuter = stateCommuter;
         }
 
-        protected ObjectAssembler Assembler { get; }
+        protected StateCommuter StateCommuter { get; }
 
         public abstract void Execute();
-        protected StateCommuter StateCommuter => Assembler.StateCommuter;        
     }
 }
\ No newline at end of file
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/EndMemberCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/EndMemberCommand.cs
index 3a28a66..7a94828 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/EndMemberCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/EndMemberCommand.cs
@@ -7,13 +7,11 @@ namespace OmniXaml.ObjectAssembler.Commands
 
     public class EndMemberCommand : Command
     {
-        private readonly ITopDownValueContext topDownValueContext;
-        private readonly IRuntimeTypeSource typeSource;
+        private readonly ITypeRepository typeRepository;
 
-        public EndMemberCommand(ObjectAssembler assembler, ITopDownValueContext topDownValueContext) : base(assembler)
+        public EndMemberCommand(ITypeRepository typeRepository, StateCommuter stateCommuter) : base(stateCommuter)
         {
-            this.topDownValueContext = topDownValueContext;
-            typeSource = Assembler.TypeSource;
+            this.typeRepository = typeRepository;
         }
 
         public override void Execute()
@@ -31,7 +29,7 @@ namespace OmniXaml.ObjectAssembler.Commands
             }            
         }
 
-        public bool IsTherePendingInstanceWaitingToBeAssigned => StateCommuter.Current.HasInstance && StateCommuter.Current.Member == null;
+        private bool IsTherePendingInstanceWaitingToBeAssigned => StateCommuter.Current.HasInstance && StateCommuter.Current.Member == null;
 
         private void AdaptCurrentCtorArgumentsToCurrentType()
         {
@@ -51,7 +49,7 @@ namespace OmniXaml.ObjectAssembler.Commands
         private IList<XamlType> GetTypesOfBestCtorMatch(XamlType xamlType, int count)
         {
             var constructor = SelectConstructor(xamlType, count);
-            return constructor.GetParameters().Select(arg => typeSource.GetByType(arg.ParameterType)).ToList();
+            return constructor.GetParameters().Select(arg => typeRepository.GetByType(arg.ParameterType)).ToList();
         }
 
         private static ConstructorInfo SelectConstructor(XamlType xamlType, int count)
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/EndObjectCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/EndObjectCommand.cs
index 7fec07b..1053022 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/EndObjectCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/EndObjectCommand.cs
@@ -1,11 +1,15 @@
 namespace OmniXaml.ObjectAssembler.Commands
 {
+    using System;
     using System.Collections;
 
     public class EndObjectCommand : Command
     {
-        public EndObjectCommand(ObjectAssembler assembler) : base(assembler)
+        private readonly Action<StateCommuter> setResult;
+
+        public EndObjectCommand(StateCommuter stateCommuter, Action<StateCommuter> setResult) : base(stateCommuter)
         {
+            this.setResult = setResult;
         }
 
         public override void Execute()
@@ -25,8 +29,8 @@ namespace OmniXaml.ObjectAssembler.Commands
                 StateCommuter.RegisterInstanceNameToNamescope();
                 StateCommuter.NotifyEnd();
             }
-            
-            Assembler.Result = StateCommuter.Current.Instance;
+
+            setResult(StateCommuter);
             
             StateCommuter.DecreaseLevel();
         }
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/GetObjectCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/GetObjectCommand.cs
index d4ed328..497a9ec 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/GetObjectCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/GetObjectCommand.cs
@@ -4,7 +4,7 @@ namespace OmniXaml.ObjectAssembler.Commands
 
     public class GetObjectCommand : Command
     {
-        public GetObjectCommand(ObjectAssembler objectAssembler) : base(objectAssembler)
+        public GetObjectCommand(StateCommuter stateCommuter) : base(stateCommuter)
         {            
         }
 
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/NamespaceDeclarationCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/NamespaceDeclarationCommand.cs
index 30a13f5..2338694 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/NamespaceDeclarationCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/NamespaceDeclarationCommand.cs
@@ -4,7 +4,7 @@ namespace OmniXaml.ObjectAssembler.Commands
     {
         private readonly NamespaceDeclaration namespaceDeclaration;
 
-        public NamespaceDeclarationCommand(ObjectAssembler assembler, NamespaceDeclaration namespaceDeclaration) : base(assembler)
+        public NamespaceDeclarationCommand(NamespaceDeclaration namespaceDeclaration, StateCommuter stateCommuter) : base(stateCommuter)
         {
             this.namespaceDeclaration = namespaceDeclaration;
         }
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/StartMemberCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/StartMemberCommand.cs
index ab4ddce..bbed42d 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/StartMemberCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/StartMemberCommand.cs
@@ -9,7 +9,7 @@ namespace OmniXaml.ObjectAssembler.Commands
     {
         private readonly MemberBase member;
 
-        public StartMemberCommand(ObjectAssembler assembler, MemberBase member) : base(assembler)
+        public StartMemberCommand(StateCommuter stateCommuter, MemberBase member) : base(stateCommuter)
         {
             this.member = member;
         }
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/StartObjectCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/StartObjectCommand.cs
index 4e53b68..fcfd9ec 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/StartObjectCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/StartObjectCommand.cs
@@ -5,11 +5,13 @@ namespace OmniXaml.ObjectAssembler.Commands
 
     public class StartObjectCommand : Command
     {
+        private readonly ITypeRepository typeRepository;
         private readonly XamlType xamlType;
         private readonly object rootInstance;
 
-        public StartObjectCommand(ObjectAssembler assembler, XamlType xamlType, object rootInstance) : base(assembler)
+        public StartObjectCommand(StateCommuter stateCommuter, ITypeRepository typeRepository, XamlType xamlType, object rootInstance) : base(stateCommuter)
         {
+            this.typeRepository = typeRepository;
             this.xamlType = xamlType;
             this.rootInstance = rootInstance;
         }
@@ -44,8 +46,8 @@ namespace OmniXaml.ObjectAssembler.Commands
                 {
                     tempQualifier.Current.Collection = collection;
                 }
-                var typeSource = Assembler.TypeSource;
-                var xamlTypeOfInstance = typeSource.GetByType(rootInstance.GetType());
+
+                var xamlTypeOfInstance = typeRepository.GetByType(rootInstance.GetType());
                 StateCommuter.Current.XamlType = xamlTypeOfInstance;
             }
         }
diff --git a/Source/OmniXaml/ObjectAssembler/Commands/ValueCommand.cs b/Source/OmniXaml/ObjectAssembler/Commands/ValueCommand.cs
index e2deb9a..eb09809 100644
--- a/Source/OmniXaml/ObjectAssembler/Commands/ValueCommand.cs
+++ b/Source/OmniXaml/ObjectAssembler/Commands/ValueCommand.cs
@@ -1,13 +1,15 @@
 namespace OmniXaml.ObjectAssembler.Commands
 {
+    using Typing;
+
     public class ValueCommand : Command
     {
         private readonly string value;
 
-        public ValueCommand(ObjectAssembler objectAssembler, ITopDownValueContext topDownValueContext, string value) : base(objectAssembler)
+        public ValueCommand(StateCommuter stateCommuter, ITypeRepository typeSource, ITopDownValueContext topDownValueContext, string value) : base(stateCommuter)
         {
             this.value = value;
-            ValuePipeLine = new ValuePipeline(objectAssembler.TypeSource, topDownValueContext);
+            ValuePipeLine = new ValuePipeline(typeSource, topDownValueContext);
         }
 
         private ValuePipeline ValuePipeLine { get; }
@@ -18,7 +20,6 @@ namespace OmniXaml.ObjectAssembler.Commands
             {
                 case ValueProcessingMode.InitializationValue:
                     StateCommuter.Current.Instance = ValuePipeLine.ConvertValueIfNecessary(value, StateCommuter.Current.XamlType);
-            
                     break;
 
                 case ValueProcessingMode.Key:
diff --git a/Source/OmniXaml/ObjectAssembler/ObjectAssembler.cs b/Source/OmniXaml/ObjectAssembler/ObjectAssembler.cs
index 62470be..6571585 100644
--- a/Source/OmniXaml/ObjectAssembler/ObjectAssembler.cs
+++ b/Source/OmniXaml/ObjectAssembler/ObjectAssembler.cs
@@ -54,25 +54,25 @@ namespace OmniXaml.ObjectAssembler
             switch (instruction.InstructionType)
             {
                 case InstructionType.NamespaceDeclaration:
-                    command = new NamespaceDeclarationCommand(this, instruction.NamespaceDeclaration);
+                    command = new NamespaceDeclarationCommand(instruction.NamespaceDeclaration, StateCommuter);
                     break;
                 case InstructionType.StartObject:
-                    command = new StartObjectCommand(this, instruction.XamlType, rootInstance);
+                    command = new StartObjectCommand(StateCommuter, TypeSource, instruction.XamlType, rootInstance);
                     break;
                 case InstructionType.StartMember:
-                    command = new StartMemberCommand(this, GetActualMemberFromMemberSpecifiedInInstruction(instruction.Member));
+                    command = new StartMemberCommand(StateCommuter, GetActualMemberFromMemberSpecifiedInInstruction(instruction.Member));
                     break;
                 case InstructionType.Value:
-                    command = new ValueCommand(this, TopDownValueContext, (string) instruction.Value);
+                    command = new ValueCommand(StateCommuter, this.TypeSource, TopDownValueContext, (string)instruction.Value);
                     break;
                 case InstructionType.EndObject:
-                    command = new EndObjectCommand(this);
+                    command = new EndObjectCommand(StateCommuter, stateCommuter => Result = stateCommuter.Current.Instance);
                     break;
                 case InstructionType.EndMember:
-                    command = new EndMemberCommand(this, TopDownValueContext);
+                    command = new EndMemberCommand(TypeSource, StateCommuter);
                     break;
                 case InstructionType.GetObject:
-                    command = new GetObjectCommand(this);
+                    command = new GetObjectCommand(StateCommuter);
                     break;
                 default:
                     throw new ParseException($"The XamlInstructionType {instruction.InstructionType} has an unexpected value");
@@ -84,13 +84,12 @@ namespace OmniXaml.ObjectAssembler
         public void OverrideInstance(object instance)
         {
             StateCommuter.RaiseLevel();
-            var tempQualifier = StateCommuter;
-            tempQualifier.Current.Instance = instance;
+            StateCommuter.Current.Instance = instance;
 
             var collection = instance as ICollection;
             if (collection != null)
             {
-                tempQualifier.Current.Collection = collection;
+                StateCommuter.Current.Collection = collection;
             }
         }
 
diff --git a/Source/Tests/OmniXaml.Tests/LookaheadBufferTests.cs b/Source/Tests/OmniXaml.Tests/LookaheadBufferTests.cs
index 141f233..b833dcc 100644
--- a/Source/Tests/OmniXaml.Tests/LookaheadBufferTests.cs
+++ b/Source/Tests/OmniXaml.Tests/LookaheadBufferTests.cs
@@ -11,7 +11,7 @@
     [TestClass]
     public class LookaheadBufferTests : GivenARuntimeTypeSourceWithNodeBuildersNetCore
     {
-        private InstructionResources resources;
+        private readonly InstructionResources resources;
 
         public LookaheadBufferTests()
         {