diff --git a/packages/ember-metal/lib/property_get.js b/packages/ember-metal/lib/property_get.js
index 6e016947c7b..1daf62517de 100644
--- a/packages/ember-metal/lib/property_get.js
+++ b/packages/ember-metal/lib/property_get.js
@@ -51,12 +51,15 @@ export let UNHANDLED_GET = symbol("UNHANDLED_GET");
   @public
 */
 export function get(obj, keyName) {
+  Ember.deprecate(`Get must be called with two arguments; an object and a property key`,
+                  arguments.length === 2);
   // Helpers that operate with 'this' within an #each
   if (keyName === '') {
     return obj;
   }
 
   if (!keyName && 'string' === typeof obj) {
+    Ember.deprecate('Calling Ember.get with only a property key has been deprecated, please also specify a target object.');
     keyName = obj;
     obj = Ember.lookup;
   }
@@ -65,6 +68,7 @@ export function get(obj, keyName) {
   Ember.assert(`Cannot call get with '${keyName}' on an undefined object.`, obj !== undefined);
 
   if (isNone(obj)) {
+    Ember.deprecate('Calling Ember.get without a target object has been deprecated, please specify a target object.');
     return _getPath(obj, keyName);
   }
 
@@ -159,6 +163,8 @@ export function _getPath(root, path) {
   // detect complicated paths and normalize them
   hasThis = pathHasThis(path);
 
+  Ember.deprecate(`Ember.get with 'this' in the path has been deprecated. Please use the same path without 'this'.`, !hasThis);
+
   if (!root || hasThis) {
     tuple = normalizeTuple(root, path);
     root = tuple[0];
@@ -169,7 +175,7 @@ export function _getPath(root, path) {
   parts = path.split(".");
   len = parts.length;
   for (idx = 0; root != null && idx < len; idx++) {
-    root = get(root, parts[idx], true);
+    root = get(root, parts[idx]);
     if (root && root.isDestroyed) { return undefined; }
   }
   return root;
diff --git a/packages/ember-metal/lib/property_set.js b/packages/ember-metal/lib/property_set.js
index acf284c2629..bb9cb20274d 100644
--- a/packages/ember-metal/lib/property_set.js
+++ b/packages/ember-metal/lib/property_set.js
@@ -34,13 +34,17 @@ export let UNHANDLED_SET = symbol("UNHANDLED_SET");
 export function set(obj, keyName, value, tolerant) {
   if (typeof obj === 'string') {
     Ember.assert(`Path '${obj}' must be global if no obj is given.`, isGlobalPath(obj));
+    Ember.deprecate('Calling Ember.set with only a property key and a value has been deprecated, please also specify a target object.');
     value = keyName;
     keyName = obj;
     obj = Ember.lookup;
   }
 
+  Ember.deprecate(`Set must be called with tree or four arguments; an object, a property key, a value and tolerant true/false`,
+                  arguments.length === 3 || arguments.length === 4);
   Ember.assert(`Cannot call set with '${keyName}' key.`, !!keyName);
 
+
   if (obj === Ember.lookup) {
     return setPath(obj, keyName, value, tolerant);
   }
@@ -62,6 +66,7 @@ export function set(obj, keyName, value, tolerant) {
 
   var isUnknown, currentValue;
   if ((!obj || desc === undefined) && isPath(keyName)) {
+    Ember.deprecate('Calling Ember.set without a target object has been deprecated, please specify a target object.', !!obj);
     return setPath(obj, keyName, value, tolerant);
   }
 
@@ -139,6 +144,8 @@ function setPath(root, path, value, tolerant) {
   // get the root
   if (path !== 'this') {
     root = getPath(root, path);
+  } else {
+    Ember.deprecate(`Ember.set with 'this' in the path has been deprecated. Please use the same path without 'this'.`);
   }
 
   if (!keyName || keyName.length === 0) {
diff --git a/packages/ember-metal/tests/accessors/get_path_test.js b/packages/ember-metal/tests/accessors/get_path_test.js
index 9789c7bf367..83fd3ad59b5 100644
--- a/packages/ember-metal/tests/accessors/get_path_test.js
+++ b/packages/ember-metal/tests/accessors/get_path_test.js
@@ -65,14 +65,17 @@ QUnit.test('[obj, foothis.bar] -> obj.foothis.bar', function() {
 });
 
 QUnit.test('[obj, this.foo] -> obj.foo', function() {
+  expectDeprecation(/Ember.get with 'this' in the path has been deprecated. Please use the same path without 'this'./);
   deepEqual(get(obj, 'this.foo'), obj.foo);
 });
 
 QUnit.test('[obj, this.foo.bar] -> obj.foo.bar', function() {
+  expectDeprecation(/Ember.get with 'this' in the path has been deprecated. Please use the same path without 'this'./);
   deepEqual(get(obj, 'this.foo.bar'), obj.foo.bar);
 });
 
 QUnit.test('[obj, this.Foo.bar] -> (undefined)', function() {
+  expectDeprecation(/Ember.get with 'this' in the path has been deprecated. Please use the same path without 'this'./);
   equal(get(obj, 'this.Foo.bar'), undefined);
 });
 
@@ -109,18 +112,22 @@ QUnit.test('[obj, Foo.bar] -> (undefined)', function() {
 //
 
 QUnit.test('[null, Foo] -> Foo', function() {
+  expectDeprecation(/Calling Ember.get without a target object has been deprecated, please specify a target object./);
   equal(get(null, 'Foo'), Foo);
 });
 
 QUnit.test('[null, Foo.bar] -> Foo.bar', function() {
+  expectDeprecation(/Calling Ember.get without a target object has been deprecated, please specify a target object./);
   deepEqual(get(null, 'Foo.bar'), Foo.bar);
 });
 
 QUnit.test('[null, $foo] -> $foo', function() {
+  expectDeprecation(/Calling Ember.get without a target object has been deprecated, please specify a target object./);
   equal(get(null, '$foo'), window.$foo);
 });
 
 QUnit.test('[null, aProp] -> null', function() {
+  expectDeprecation(/Calling Ember.get without a target object has been deprecated, please specify a target object./);
   equal(get(null, 'aProp'), null);
 });
 
@@ -129,13 +136,16 @@ QUnit.test('[null, aProp] -> null', function() {
 //
 
 QUnit.test('[Foo] -> Foo', function() {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
   deepEqual(get('Foo'), Foo);
 });
 
 QUnit.test('[aProp] -> aProp', function() {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
   deepEqual(get('aProp'), window.aProp);
 });
 
 QUnit.test('[Foo.bar] -> Foo.bar', function() {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
   deepEqual(get('Foo.bar'), Foo.bar);
 });
diff --git a/packages/ember-metal/tests/accessors/get_test.js b/packages/ember-metal/tests/accessors/get_test.js
index 23b53f6e3a7..846c870792b 100644
--- a/packages/ember-metal/tests/accessors/get_test.js
+++ b/packages/ember-metal/tests/accessors/get_test.js
@@ -111,10 +111,12 @@ QUnit.test('warn on attempts to get a property path of undefined', function() {
 });
 
 QUnit.test('returns null when fetching a complex local path on a null context', function() {
+  expectDeprecation(/Calling Ember.get without a target object has been deprecated, please specify a target object./);
   equal(get(null, 'aProperty.on.aPath'), null);
 });
 
 QUnit.test('returns null when fetching a simple local path on a null context', function() {
+  expectDeprecation(/Calling Ember.get without a target object has been deprecated, please specify a target object./);
   equal(get(null, 'aProperty'), null);
 });
 
diff --git a/packages/ember-metal/tests/accessors/set_path_test.js b/packages/ember-metal/tests/accessors/set_path_test.js
index b64d0b7ea04..070a551eb22 100644
--- a/packages/ember-metal/tests/accessors/set_path_test.js
+++ b/packages/ember-metal/tests/accessors/set_path_test.js
@@ -63,11 +63,13 @@ QUnit.test('[obj, foo.bar] -> obj.foo.bar', function() {
 });
 
 QUnit.test('[obj, this.foo] -> obj.foo', function() {
+  expectDeprecation(/Ember.set with 'this' in the path has been deprecated. Please use the same path without 'this'./);
   set(obj, 'this.foo', "BAM");
   equal(get(obj, 'foo'), "BAM");
 });
 
 QUnit.test('[obj, this.foo.bar] -> obj.foo.bar', function() {
+  expectDeprecation(/Ember.get with 'this' in the path has been deprecated. Please use the same path without 'this'./);
   set(obj, 'this.foo.bar', "BAM");
   equal(get(obj, 'foo.bar'), "BAM");
 });
@@ -77,10 +79,17 @@ QUnit.test('[obj, this.foo.bar] -> obj.foo.bar', function() {
 //
 
 QUnit.test('[null, Foo.bar] -> Foo.bar', function() {
+  expectDeprecation(/Calling Ember.set without a target object has been deprecated, please specify a target object./);
   set(null, 'Foo.bar', "BAM");
   equal(get(Ember.lookup.Foo, 'bar'), "BAM");
 });
 
+QUnit.test('[Foo.bar] -> Foo.bar', function() {
+  expectDeprecation(/Calling Ember.set with only a property key and a value has been deprecated, please also specify a target object./);
+  set('Foo.bar', "BAM");
+  equal(get(Ember.lookup.Foo, 'bar'), "BAM");
+});
+
 // ..........................................................
 // DEPRECATED
 //
diff --git a/packages/ember-metal/tests/computed_test.js b/packages/ember-metal/tests/computed_test.js
index cacae27767a..1885e320751 100644
--- a/packages/ember-metal/tests/computed_test.js
+++ b/packages/ember-metal/tests/computed_test.js
@@ -581,6 +581,7 @@ testBoth('depending on simple chain', function(get, set) {
 });
 
 testBoth('depending on Global chain', function(get, set) {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
 
   // assign computed property
   defineProperty(obj, 'prop', computed(function() {
diff --git a/packages/ember-runtime/tests/legacy_1x/mixins/observable/observable_test.js b/packages/ember-runtime/tests/legacy_1x/mixins/observable/observable_test.js
index 673496d2fc5..ad8f9176b7b 100644
--- a/packages/ember-runtime/tests/legacy_1x/mixins/observable/observable_test.js
+++ b/packages/ember-runtime/tests/legacy_1x/mixins/observable/observable_test.js
@@ -158,6 +158,7 @@ QUnit.test("raise if the provided object is undefined", function() {
 });
 
 QUnit.test("should work when object is Ember (used in Ember.get)", function() {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
   equal(get('Ember.RunLoop'), Ember.RunLoop, 'Ember.get');
   equal(get(Ember, 'RunLoop'), Ember.RunLoop, 'Ember.get(Ember, RunLoop)');
 });
@@ -173,6 +174,7 @@ QUnit.module("Ember.get() with paths", {
 });
 
 QUnit.test('should return a property at a given path relative to the lookup', function() {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
   lookup.Foo = ObservableObject.extend({
     Bar: ObservableObject.extend({
       Baz: computed(function() { return 'blargh'; }).volatile()
@@ -193,6 +195,7 @@ QUnit.test("should return a property at a given path relative to the passed obje
 });
 
 QUnit.test("should return a property at a given path relative to the lookup - JavaScript hash", function() {
+  expectDeprecation(/Calling Ember.get with only a property key has been deprecated, please also specify a target object/);
   lookup.Foo = {
     Bar: {
       Baz: "blargh"
diff --git a/packages/ember-runtime/tests/mixins/deferred_test.js b/packages/ember-runtime/tests/mixins/deferred_test.js
index 886fa164477..6b0fdd50773 100644
--- a/packages/ember-runtime/tests/mixins/deferred_test.js
+++ b/packages/ember-runtime/tests/mixins/deferred_test.js
@@ -351,7 +351,9 @@ if (!EmberDev.runningProdBuild) {
     var obj = {};
 
     Ember.deprecate = function(message) {
-      deprecationMade = message;
+      if (message === 'Usage of Ember.DeferredMixin or Ember.Deferred is deprecated.') {
+        deprecationMade = true;
+      }
     };
 
     deferred = EmberObject.extend(Deferred).create();
@@ -360,7 +362,7 @@ if (!EmberDev.runningProdBuild) {
     deferred.then(function(value) {
       equal(value, obj, "successfully resolved to given value");
     });
-    equal(deprecationMade, 'Usage of Ember.DeferredMixin or Ember.Deferred is deprecated.');
+    equal(deprecationMade, true, 'the deprecation was made');
 
     run(deferred, 'resolve', obj);
   });