Collective efficacy has to do with a group of people working together as a cohesive unit toward a common goal.

"http://wiki.answers.com/Q/The_efficacy_of_collective_bargaining_for_industrial_harmony"

political efficacy

Efficacy is the capacity to produce an effect. It is these conditions that distinguish efficacy from the related concept of effectiveness, which relates to change under real-life conditions. -- Wikipedia: "efficacy"

What type of feedback can damage Self-efficacy