Just for reference, P3 is Primavera Project Planner, a very high-end
(last time I looked, years ago, $4500/seat) scheduling software package
used mainly for DOD and large government projects. To compare to
Project, think of Project as a Nissan Sentra and P3 as an 18 wheeler.
The introductory course offered by Primavera was 2 weeks, and I was
told by a knowledgable user that it takes 6 mos. to a year of heavy use
to get to know it.
Primavera also makes a product called SureTrak, which is a competitor
to Project.