We know that kids learn better when they have a part in their goal setting and achievement. Use this simple rubric based performance evaluation for students that need help in many areas of music and performance. You can assign this as a lesson plan or go over with students together. The goal is to evaluate all aspects of performance and self-critique for improvement or realization of goals accomplished.
You can use this with a group or individually to critique a video recording (or audio). I primarily use video for these but you could adjust if needed.