diff --git a/T4TS.Example/Models/Partial.First.cs b/T4TS.Example/Models/Partial.First.cs
new file mode 100644
index 0000000..f37c457
--- /dev/null
+++ b/T4TS.Example/Models/Partial.First.cs
@@ -0,0 +1,9 @@
+using System;
+
+namespace T4TS.Example.Models
+{
+    partial class Partial
+    {
+        public string FromFirstClass { get; set; }
+    }
+}
diff --git a/T4TS.Example/Models/Partial.Second.cs b/T4TS.Example/Models/Partial.Second.cs
new file mode 100644
index 0000000..8b17d20
--- /dev/null
+++ b/T4TS.Example/Models/Partial.Second.cs
@@ -0,0 +1,11 @@
+using System;
+
+namespace T4TS.Example.Models
+{
+    [TypeScriptInterface]
+    partial class Partial
+    {
+        public string FromSecondClass { get; set; }
+        public bool? AlsoSecondClass { get; set; }
+    }
+}
diff --git a/T4TS.Example/Scripts/App/Test.ts b/T4TS.Example/Scripts/App/Test.ts
index c22c795..f70bafd 100644
--- a/T4TS.Example/Scripts/App/Test.ts
+++ b/T4TS.Example/Scripts/App/Test.ts
@@ -3,12 +3,20 @@
 
 module App {
     export class Test {
-        
-        constructor () {
+        private partialClass: T4TS.Partial;
+
+        constructor() {
+
+            this.partialClass = {
+                FromFirstClass: '',
+                FromSecondClass: '',
+                AlsoSecondClass: true
+            };
+
             // Make an AJAX post and get some data from the server.
             // In the callback, you can specify that the data is of a certain type:
-            $.post('./example', {}, (data: Fooz.Foobar) => {
-                
+            $.post('./example', {}, (data: Fooz.IFoobar) => {
+
                 // Intellisense support for the properties:
                 alert(data.NestedObjectArr[0].Name);
                 alert(data.Recursive.OverrideAll ? "1" : "0");
diff --git a/T4TS.Example/T4TS.Example.csproj b/T4TS.Example/T4TS.Example.csproj
index 9423af0..360a331 100644
--- a/T4TS.Example/T4TS.Example.csproj
+++ b/T4TS.Example/T4TS.Example.csproj
@@ -46,6 +46,8 @@
     <Compile Include="Models\InheritanceTest3.cs" />
     <Compile Include="Models\InheritanceTest4.cs" />
     <Compile Include="Models\Inherited.cs" />
+    <Compile Include="Models\Partial.First.cs" />
+    <Compile Include="Models\Partial.Second.cs" />
     <Compile Include="Models\TestClass.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Content Include="T4TS.d.ts">
diff --git a/T4TS.Example/T4TS.d.ts b/T4TS.Example/T4TS.d.ts
index ced8892..e15c149 100644
--- a/T4TS.Example/T4TS.d.ts
+++ b/T4TS.Example/T4TS.d.ts
@@ -56,4 +56,13 @@ module T4TS {
         TwoDimList: number[][];
         [index: number]: Barfoo;
     }
+    /** Generated from T4TS.Example.Models.Partial **/
+    export interface Partial {
+        FromFirstClass: string;
+    }
+    /** Generated from T4TS.Example.Models.Partial **/
+    export interface Partial {
+        FromSecondClass: string;
+        AlsoSecondClass?: any;
+    }
 }
diff --git a/T4TS.Example/T4TS.tt b/T4TS.Example/T4TS.tt
index 665e65b..b42581a 100644
--- a/T4TS.Example/T4TS.tt
+++ b/T4TS.Example/T4TS.tt
@@ -3,17 +3,20 @@
 <#@ assembly name="System.Core" #>
 <#@ assembly name="Microsoft.VisualStudio.Shell.Interop.8.0" #>
 <#@ assembly name="EnvDTE" #>
+<#@ assembly name="EnvDTE80" #>
+<#@ assembly name="$(SolutionDir)\\T4TS\\bin\\Debug\\T4TS.Dll" #>
 <#@ import namespace="System.Collections.Generic" #>
 <#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
 <#@ import namespace="EnvDTE" #>
+<#@ import namespace="T4TS" #>
 <#@ import namespace="Microsoft.VisualStudio.Shell.Interop" #>
 <#@ import namespace="Microsoft.VisualStudio.TextTemplating" #>
-<#@ assembly name="$(SolutionDir)\\T4TS\\bin\\Debug\\T4TS.Dll" #>
 <#@ Include File="T4TS.tt.settings.t4" #>
 <#= 
     T4TS.OutputFormatter.GetOutput(GetDataToRender()) #><#+ 
 
-List<T4TS.TypeScriptModule> GetDataToRender() {
+List<TypeScriptModule> GetDataToRender() {
     DTE dte = null;
 
     // Get the DTE service from the host
@@ -31,7 +34,7 @@ List<T4TS.TypeScriptModule> GetDataToRender() {
         throw new Exception("Could not find the VS project containing the T4TS file.");
 
     // Read settings from T4TS.tt.settings.tt
-    var settings = new T4TS.Settings
+    var settings = new Settings
     {
         DefaultModule = DefaultModule,
         DefaultOptional = DefaultOptional,
@@ -39,7 +42,7 @@ List<T4TS.TypeScriptModule> GetDataToRender() {
         DefaultInterfaceNamePrefix = DefaultInterfaceNamePrefix
     };
 
-    var generator = new T4TS.CodeTraverser(project, settings);
+    var generator = new CodeTraverser(project, settings);
 
     return generator.GetAllInterfaces().ToList();
 }
@@ -60,5 +63,4 @@ Project GetProjectContainingT4File(DTE dte) {
 
     return projectItem.ContainingProject;
 }
-
 #>
diff --git a/T4TS/CodeTraverser.cs b/T4TS/CodeTraverser.cs
index 5de7455..2e6f3c8 100644
--- a/T4TS/CodeTraverser.cs
+++ b/T4TS/CodeTraverser.cs
@@ -1,11 +1,7 @@
 using EnvDTE;
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
-using System.Reflection;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace T4TS
 {
@@ -32,6 +28,7 @@ public CodeTraverser(Project project, Settings settings)
         public TypeContext BuildContext()
         {
             var typeContext = new TypeContext();
+            var partialClasses = new Dictionary<string, CodeClass>();
 
             new ProjectTraverser(this.Project, (ns) =>
             {
@@ -42,9 +39,10 @@ public TypeContext BuildContext()
                         return;
 
                     var values = GetInterfaceValues(codeClass, attribute);
-                    var customType = new CustomType(GetInterfaceName(values), values.Module);
+                    var interfaceType = new InterfaceType(values);
 
-                    typeContext.AddCustomType(codeClass.FullName, customType);
+                    if (!typeContext.ContainsInterfaceType(codeClass.FullName))
+                        typeContext.AddInterfaceType(codeClass.FullName, interfaceType);
                 });
             });
 
@@ -61,15 +59,12 @@ public IEnumerable<TypeScriptModule> GetAllInterfaces()
             {
                 new NamespaceTraverser(ns, (codeClass) =>
                 {
-                    if (codeClass.Attributes == null || codeClass.Attributes.Count == 0)
+                    InterfaceType interfaceType;
+                    if (!typeContext.TryGetInterfaceType(codeClass.FullName, out interfaceType))
                         return;
 
-                    CodeAttribute attribute;
-                    if (!TryGetAttribute(codeClass.Attributes, InterfaceAttributeFullName, out attribute))
-                        return;
-
-                    var values = GetInterfaceValues(codeClass, attribute);
-
+                    var values = interfaceType.AttributeValues;
+                    
                     TypeScriptModule module;
                     if (!byModuleName.TryGetValue(values.Module, out module))
                     {
@@ -123,6 +118,7 @@ private TypeScriptInterface BuildInterface(CodeClass codeClass, TypeScriptInterf
                 if (TryGetMember(property, typeContext, out member))
                     tsInterface.Members.Add(member);
             });
+
             return tsInterface;
         }
 
@@ -190,7 +186,7 @@ private bool TryGetMember(CodeProperty property, TypeContext typeContext, out Ty
                 Optional = values.Optional,
                 Type = (string.IsNullOrWhiteSpace(values.Type))
                     ? typeContext.GetTypeScriptType(getter.Type)
-                    : new CustomType(values.Type)
+                    : new InterfaceType(values.Type)
             };
 
             if (values.CamelCase && values.Name == null)
diff --git a/T4TS/Outputs/TypeScriptInterfaceAttributeValues.cs b/T4TS/Outputs/TypeScriptInterfaceAttributeValues.cs
index a2c4b0e..1fdd025 100644
--- a/T4TS/Outputs/TypeScriptInterfaceAttributeValues.cs
+++ b/T4TS/Outputs/TypeScriptInterfaceAttributeValues.cs
@@ -1,9 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using EnvDTE;
 
 namespace T4TS
 {
diff --git a/T4TS/T4TS.csproj b/T4TS/T4TS.csproj
index f28b095..d17c62d 100644
--- a/T4TS/T4TS.csproj
+++ b/T4TS/T4TS.csproj
@@ -61,7 +61,7 @@
     <Compile Include="Outputs\TypeScriptModule.cs" />
     <Compile Include="Types\ArrayType.cs" />
     <Compile Include="Types\BoolType.cs" />
-    <Compile Include="Types\CustomType.cs" />
+    <Compile Include="Types\InterfaceType.cs" />
     <Compile Include="Types\NullableType.cs" />
     <Compile Include="Types\NumberType.cs" />
     <Compile Include="Types\StringType.cs" />
diff --git a/T4TS/Traversal/ClassTraverser.cs b/T4TS/Traversal/ClassTraverser.cs
index c387fe1..92a7311 100644
--- a/T4TS/Traversal/ClassTraverser.cs
+++ b/T4TS/Traversal/ClassTraverser.cs
@@ -1,9 +1,6 @@
 using EnvDTE;
 using System;
-using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace T4TS
 {
diff --git a/T4TS/Traversal/NamespaceTraverser.cs b/T4TS/Traversal/NamespaceTraverser.cs
index cefc5a5..818890e 100644
--- a/T4TS/Traversal/NamespaceTraverser.cs
+++ b/T4TS/Traversal/NamespaceTraverser.cs
@@ -1,9 +1,6 @@
 using EnvDTE;
 using System;
-using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace T4TS
 {
diff --git a/T4TS/Traversal/ProjectTraverser.cs b/T4TS/Traversal/ProjectTraverser.cs
index 484d609..aca7b4e 100644
--- a/T4TS/Traversal/ProjectTraverser.cs
+++ b/T4TS/Traversal/ProjectTraverser.cs
@@ -1,9 +1,6 @@
 using EnvDTE;
 using System;
-using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace T4TS
 {
diff --git a/T4TS/TypeContext.cs b/T4TS/TypeContext.cs
index 2a167d0..e2d686f 100644
--- a/T4TS/TypeContext.cs
+++ b/T4TS/TypeContext.cs
@@ -1,9 +1,6 @@
 using EnvDTE;
-using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace T4TS
 {
@@ -18,18 +15,23 @@ public class TypeContext
         private static readonly string nullableTypeStart = "System.Nullable<";
 
         /// <summary>
-        /// Lookup table for "custom types", ie. non-builtin types. Keyed on the FullName of the type.
+        /// Lookup table for "interface types", ie. non-builtin types (typically classes or unknown types). Keyed on the FullName of the type.
         /// </summary>
-        private Dictionary<string, CustomType> customTypes = new Dictionary<string, CustomType>();
+        private Dictionary<string, InterfaceType> interfaceTypes = new Dictionary<string, InterfaceType>();
 
-        public void AddCustomType(string typeFullName, CustomType customType)
+        public void AddInterfaceType(string typeFullName, InterfaceType interfaceType)
         {
-            customTypes.Add(typeFullName, customType);
+            interfaceTypes.Add(typeFullName, interfaceType);
         }
 
-        public bool TryGetCustomType(string typeFullName, out CustomType customType)
+        public bool TryGetInterfaceType(string typeFullName, out InterfaceType interfaceType)
         {
-            return customTypes.TryGetValue(typeFullName, out customType);
+            return interfaceTypes.TryGetValue(typeFullName, out interfaceType);
+        }
+
+        public bool ContainsInterfaceType(string typeFullName)
+        {
+            return interfaceTypes.ContainsKey(typeFullName);
         }
 
         public TypescriptType GetTypeScriptType(CodeTypeRef codeType)
@@ -80,9 +82,9 @@ private ArrayType TryResolveEnumerableType(string typeFullName)
 
         public TypescriptType GetTypeScriptType(string typeFullName)
         {
-            CustomType customType;
-            if (customTypes.TryGetValue(typeFullName, out customType))
-                return customType;
+            InterfaceType interfaceType;
+            if (interfaceTypes.TryGetValue(typeFullName, out interfaceType))
+                return interfaceType;
 
             if (IsGenericEnumerable(typeFullName))
             {
diff --git a/T4TS/Types/CustomType.cs b/T4TS/Types/CustomType.cs
deleted file mode 100644
index 147ea78..0000000
--- a/T4TS/Types/CustomType.cs
+++ /dev/null
@@ -1,34 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace T4TS
-{
-    public class CustomType: TypescriptType
-    {
-        private string m_name;
-
-        public override string Name
-        {
-            get { return m_name; }
-        }
-        
-        public string QualifedModule { get; private set; }
-
-        public CustomType(string name, string qualifiedModule=null)
-        {
-            m_name = name;
-            this.QualifedModule = qualifiedModule;
-        }
-
-        public override string ToString()
-        {
-            if (string.IsNullOrWhiteSpace(QualifedModule))
-                return base.ToString();
-
-            return QualifedModule + "." + base.ToString();
-        }
-    }
-}
diff --git a/T4TS/Types/InterfaceType.cs b/T4TS/Types/InterfaceType.cs
new file mode 100644
index 0000000..67d9589
--- /dev/null
+++ b/T4TS/Types/InterfaceType.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace T4TS
+{
+    public class InterfaceType : TypescriptType
+    {
+        public TypeScriptInterfaceAttributeValues AttributeValues { get; private set; }
+
+        public string QualifedModule 
+        { 
+            get 
+            {
+                if (AttributeValues == null)
+                    return null;
+
+                return AttributeValues.Module; 
+            } 
+        }
+
+        public override string Name
+        {
+            get
+            {
+                if (!string.IsNullOrEmpty(AttributeValues.NamePrefix))
+                    return AttributeValues.NamePrefix + AttributeValues.Name;
+
+                return AttributeValues.Name;
+            }
+        }
+
+        public InterfaceType(TypeScriptInterfaceAttributeValues values)
+        {
+            AttributeValues = values;
+        }
+
+        public InterfaceType(string name)
+        {
+            AttributeValues = new TypeScriptInterfaceAttributeValues
+            {
+                Name = name
+            };
+        }
+
+        public override string ToString()
+        {
+            if (string.IsNullOrWhiteSpace(QualifedModule))
+                return base.ToString();
+
+            return QualifedModule + "." + base.ToString();
+        }
+    }
+}