The are many principles of project performance management. From the Earned Value Management domain, here are the 7 core principles. Plan the Work Break Down the project work scope into finite pieces that can be assigned to a responsible person or organization for control of technical, schedule, and cost objectives... 

Jesse Fewell posts a repeat piece about “Methodology Doesn't Matter.” I've participated in the “method wars” in the past, with no progress. What I've come to understand through the school of hard knocks is that it's the outcomes we're interested in not necessary the path...