diff --git a/collection/collection-tests.ts b/collection/collection-tests.ts
new file mode 100644
index 0000000000..6f81ca872a
--- /dev/null
+++ b/collection/collection-tests.ts
@@ -0,0 +1,94 @@
+/// <reference path="collection.d.ts" />
+
+// there are various instances in these tests when the <any> type
+// is provided, this is to prevent the compiler from complaining
+// when I violate the type enforcement posed by the various
+// collection types.
+
+var assortment: Assortment = {}
+
+function testAssortment() {
+    // assortments can be indexed by either number or string
+    assortment[0] = 0;
+    assortment['1'] = 1;
+    
+    // assortments can store any type
+    assortment['a'] = 'a';
+    assortment['true'] = true;
+}
+
+testAssortment();
+
+
+var collection: Collection<number> = {};
+
+function testCollection() {
+    // collections can be indexed by either number or string
+    collection[0] = 0;
+    collection['1'] = 1;
+    
+    // a collection can always be expected to provide back its type
+    var zero: number = collection[0];
+    var one: number = collection[1];
+    
+    // collections should not store values that aren't of their type
+    collection['b'] = <any>'b'; // would have thrown compiler error
+    
+    // collections also should not return values that aren't their type
+    var b: string = <any>collection['b']; // would have thrown compiler error
+}
+
+testCollection();
+
+
+var dictionary: Dictionary = {};
+
+function testDictionary() {
+    // dictionarys can store any type and are indexed by string
+    dictionary['b'] = 'b';
+    dictionary['1'] = 1;
+    dictionary['true'] = true;
+    
+    // also, hopefully in the future, Dictionarys will error with these expressions as well
+    // However, TypeScript currently does not enforce key types for arrays
+
+    // dictionarys should not use any index value, but string
+    var newDictionary: Dictionary = <any>{0: 'a', 'b': 'b'}; // should have thrown compiler error
+    var a: string = newDictionary[<any>0]; // should have thrown compiler error
+    newDictionary[<any>1] = '1'; // should have thrown compiler error
+  
+    // dictionarys should be used with type checking because of this
+    if (typeof dictionary['b'] == 'string') {
+      var b_str: string = dictionary['b'];
+    } else if (typeof dictionary['b'] == 'number') {
+      var b_num: number = dictionary['b'];
+    }
+    
+    // but we can also just take the value if we don't care about the type
+    var one: any = dictionary['1'];
+}
+
+testDictionary();
+
+
+var thesaurus: Thesaurus<string> = {};
+
+function testThesaurus() {
+    // a thesaurus is indexed by string
+    thesaurus['word'] = 'a combination of varters';
+    
+    // it should not be indexed with any other value, but it can
+    // in the current build of TypeScript
+    var newThesaurus: Thesaurus<string> = <any>{0: '0', '1': '1'}; // should have thrown compiler
+                                                                    // error
+    var zero: string = newThesaurus[<any>0]; // should have thrown compiler error
+    newThesaurus[<any>1] = '1'; // should have thrown compile error
+    
+    // a thesaurus will return its respective value
+    var word: string = thesaurus['word'];
+    
+    // assigning any other type will throw a compiler error
+    thesaurus['two'] = <any>2; // would have thrown compiler error
+    // expecting any other type will throw a compiler error
+    var two: number = <any>thesaurus['two']; // would have thrown compiler error
+}
\ No newline at end of file
diff --git a/collection/collection.d.ts b/collection/collection.d.ts
new file mode 100644
index 0000000000..8b203d554f
--- /dev/null
+++ b/collection/collection.d.ts
@@ -0,0 +1,34 @@
+// Type definitions for collections
+// Project: https://github.com/ttowncompiled/DefinitelyTyped
+// Definitions by: Ian Riley <https://github.com/ttowncompiled>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+
+// an Assortment allows a variety of types, and each object can be referenced
+// by number or by string.
+interface Assortment {
+    [key: number]: any;
+    [key: string]: any;
+}
+
+// a Collection only allows a single type, and each object can be referenced
+// by number or by string.
+interface Collection<T> {
+    [key: number]: T;
+    [key: string]: T;
+}
+
+// a Dictionary allows a variety of types, but each object must be referenced by string.
+interface Dictionary {
+    [key: string]: any;
+}
+
+// a Thesaurus only allows a single type, but each object must be referenced by string.
+interface Thesaurus<T> {
+    [key: string]: T;
+}
+
+// an object that allows a variety of types, but each object is referenced by number
+// is: any[]
+// an object that allows only a single type, but each object is referenced by number
+// is: T[]