diff --git a/README.md b/README.md
index 9abe502..6cf1961 100755
--- a/README.md
+++ b/README.md
@@ -56,16 +56,27 @@ c instanceof B // -> true
 c instanceof A // -> true
 ```
 
+
+### Inheritance
 ```javascript
+//
+//    Base
+//     ^
+//     |
+//    Item
+//
 var Base = object.Constructor('Base', {
+    proto_attr: 'prototype attr value',
+
     get prop(){
-        return 123 },
+        return 'propery value' },
+
     method: function(){
         console.log('Base.method()') },
 
     // initializer...
     __init__: function(){
-        this.base_attribute = 321
+        this.instance_attr = 'instance'
     },
 })
 
@@ -76,19 +87,24 @@ var Item = object.Constructor('Item', {
     __init__: function(){
         // call the "super" method...
         object.parent(this.__init__, this).call(this)
-        this.item_attribute = 333
+        this.item_attr = 'instance attribute value'
     },
 })
 
 ```
 
+
+### Callable instances
 ```javascript
 // callable instance constructor...
 var Action = object.Constructor('Action',
-    // the first argument is allways the external call context, like
+    // Define a constructor as a function...
+    //
+    // The first argument is allways the external call context, like
     // normal this, but here we have two contexts:
-    //  - external -- where the instance was called from
-    //  - internal -- the instance (this)
+    //  - internal (this)       -- the instance (this)
+    //  - external (context)    -- call context
+    //
     // NOTE: if the prototype is explicitly defined as a function then
     //      it is the user's responsibility to call .__call__(..) method
     //      (see below)
@@ -104,9 +120,14 @@ action()
 
 // a different way to do the above...
 var Action2 = object.Constructor('Action2', {
-    // this is the same as the above but a bit more convenient as we do 
+    // This is the same as the above but a bit more convenient as we do 
     // not need to use Object.assign(..) or object.mixinFlat(..) to define
-    // attributes and props...
+    // attributes and props.
+    //
+    // Contexts:
+    //  - internal (this)       -- the instance
+    //  - external (context)    -- call context
+    //
     // NOTE: this is not called if a user defines the prototype as a function
     //      (see above)
     __call__: function(context, ...args){
@@ -116,13 +137,16 @@ var Action2 = object.Constructor('Action2', {
 
 ```
 
+### Low level constructor
 ```javascript
-// low level constructor...
 var LowLevel = object.Constructor('LowLevel', {
     // Low level instance constructor...
+    //
+    // Contexts:
+    //  - internal (this)       -- .prototype
+    //  - external (context)    -- call context
+    //
     // NOTE: if this is defined the return value is used as the instance
-    // NOTE: this is run in the context of the .prototype rather than 
-    //      the instance...
     // NOTE: this has priority over the callable protocols above, thus
     //      the user must take care of both the prototype as function and
     //      prototype.__call__(..)...
@@ -135,6 +159,12 @@ var LowLevel = object.Constructor('LowLevel', {
 
 ## Components
 
+```
+sources(<object>, <name>)
+sources(<object>, <name>, <callback>)
+    -> <list>
+```
+
 ```
 parent(<method>, <this>)
 parent(<method>, <name>, <this>)
diff --git a/object.js b/object.js
index 05d0b78..7d537e7 100755
--- a/object.js
+++ b/object.js
@@ -37,6 +37,33 @@ function(text){
 
 //---------------------------------------------------------------------
 
+// Get a list of sources/definitions for a prop/attr...
+//
+// 	sources(obj, name)
+// 	sources(obj, name, callback)
+// 		-> list
+//
+//
+// XXX revise name...
+var sources =
+module.sources =
+function(that, name, callback){
+	var stop
+	var res = []
+	do {
+		if(that.hasOwnProperty(name)){
+			res.push(that)
+			// handle callback...
+			stop = callback
+				&& callback(that)
+			// stop requested by callback...
+			if(stop === false || stop == 'stop'){
+				return that } }
+		that = that.__proto__
+	} while(that !== null)
+	return res }
+
+
 // Find the next parent method in the prototype chain.
 //
 // 	parent(meth, this)
@@ -63,32 +90,6 @@ function(method, name, that){
 	return that.__proto__[name] }
 
 
-// Get a list of prototypes that have a prop/attr defined ...
-//
-// 	defines(obj, name)
-// 	defines(obj, name, callback)
-// 		-> list
-//
-// XXX revise name...
-var defines =
-module.defines =
-function(that, name, callback){
-	var stop
-	var res = []
-	do {
-		if(that.hasOwnProperty(name)){
-			res.push(that)
-			// handle callback...
-			stop = callback
-				&& callback(that)
-			// stop requested by callback...
-			if(stop === false || stop == 'stop'){
-				return that } }
-		that = that.__proto__
-	} while(that !== null)
-	return res }
-
-
 
 //---------------------------------------------------------------------
 
@@ -249,6 +250,7 @@ module.C =
 function Constructor(name, a, b){
 	var proto = b == null ? a : b
 	var cls_proto = b == null ? b : a
+	proto = proto || {}
 
 	// mirror doc from target to func...
 	var _mirror = function(func, target){
@@ -259,10 +261,6 @@ function Constructor(name, a, b){
 		})
 		return func }
 
-	var __new__ = function(base, ...args){
-
-	}
-
 	var _constructor = function Constructor(){
 		// NOTE: the following does the job of the 'new' operator but
 		// 		with one advantage, we can now pass arbitrary args 
@@ -271,6 +269,7 @@ function Constructor(name, a, b){
 		//			return new _constructor(json)
 		var obj = 
 			// prototype defines .__new__(..)...
+			// XXX should the context here he _constructor or .prototype (now)???
 			_constructor.prototype.__new__ instanceof Function ?
 				_constructor.prototype.__new__(this, ...arguments)
 			// prototype is a function...
diff --git a/package.json b/package.json
index 64f073a..f07293e 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ig-object",
-  "version": "2.1.1",
+  "version": "2.2.0",
   "description": "",
   "main": "object.js",
   "scripts": {