Here's a great summary of Agile techniques. It's in ComputerWorld's Development section, in an article by Heather Havenstein: "Five Web 2.0 app dev lessons for enterprise IT ". I think the article is mis-titled, since it's basically "Agile for Big IT."

Some of the five techniques are motherhood and apple-pie …

In Object Modeling , I repeated a procedure for object identification that comes from the classic Object-Oriented Modeling and Design (Rumbaugh, et. al.)

Objects are characterized by their state change. Therefore, to distinguish among classes of objects, we need to determine if two objects have the same states and state transitions …