Understanding Layers Presentation

This is a layers presentation that I created in 2012 but the concepts remain relevant, at least through Creo 3.  How layers work comes up often, and this has helped several people, so I thought I'd put it in it's own document.

My original blog post on it is here:

http://www.design-central.com/index.cfm/news/news-entries/understanding-layers-in-pro-engineer/

Inspired by the 2007 layers presentation by Glenn Beer and subsequent discussion at MCAD Central here:

MCAD Central