How do I evaluate my players?

The evaluation on my sheet has, serve, forehand, backhand, volleys, overhead, return to serve and movement, and I rate the players from excellent to poor from week to week. I hand out this evaluation form to the player and the parents and at the bottom I write out things like comments about that weeks progress or development. I have other skills typically there are characteristics like strength, agility, speed, endurance, aerobic strength and any other skills necessarily that need measurement. this is an effort to show the stages of progress or lack of effort/progress.