Welcome aboard. Been some time since you posted but how are you making out. Windchill can be a beast like TC. The customizer's guide is good but some of the examples and topics are rather deep. I like to stay around the edges. Listeners, Reports (QueryBuilder), workflow coding are good places to start. The API docs are good but you'll find that there is more than what is documented. Not sure what TC is coded in but brush up on your Java and JSP. How is it going do far? I'd be interested to get your thoughts for comparison.