Plan, execute, evaluate sounds simple, but most projects aren't well planned nor are they evaluated well. The tendency is to jump right into execution and as soon as execution is completed (which usually isn't soon), move on to the next project without evaluating what happen on the present project and what could have been improved. Successful project management requires more front and back end resources (and less middle) than are usually allocated.
These articles can help point you in the right direction:
Project Planning A Step by Step Guide
Undertaking a Successful Project Audit
Feedback is welcome.
Duncan
Project Smart
Exploring trends and developments in project management today