2/21/2012 10:36 AM. P2 - 2. Session Outline. . What is a WBS and where is it useful?What is successive decomposition?How is the WBS used on a program?How can I tell if I have a good WBS?Numbering notation.Examples.Common errors.. Outline. 2/21/2012 10:36 AM. P2 - 3. Where is WBS Useful?. Rocket Science?Brain Surgery?CVISN?.