One of the things I love about Boson EXSIM questions is that they give you awesome explanations for questions and also the reference material they are using from Cisco. I had a practice question on PPDIOO for the SWITCH exam and it had a link to a great PPDIOO resource that was in the most obscure place - Unified Communications.
Here is the link, it's one of the better explanations of PPDIOO and planning tasks in general with resepct to Cisco.
Cisco Unified Communications System for Contact Center Release 6.0(1) - Cisco Systems