Effectiveness: How effective the skill is at accomplishing its goal. To this end includes activation rate and frequency, among others.
Overall Usefulness: How will these skills help your individual units in each chapter? In the long run?
Contributions to Completion: How the skills help complete chapters efficiently (this does not mean lowest possible turncount; it instead refers to an average completion time for a chapter)
Availability: This is not looked at as much, but it is looked at when looking at units with each skill and who has them. This is only used when debating nitty-gritty.
My Name is Pursuit and I'm Hilariously Broken Tier
Edited by Hamlet, 09 January 2013 - 05:14 PM.