On PE Universe, a blog I follow, there has been lots of activity around skill checklists. I am so thankful for Colorado State Standards and the detailed work in the student evidence outcomes. Essentially this checklist published by CDE is my roadmap. I set up my gradebook from the evidence outcomes. Then I take notes on where students are compared to where they need to be. I use informal assessments, exit slips, teacher observation, partner think pair share, thumbs up, peer observation, video recordings all to assess where my students are at compared to where they need to be.
This publication details what skills need to be mastered at each grade level. The Colorado State Standards parallel the National standards so even if you are not teaching in the state of Colorado this would be a great resource for you! If you are interested there is a link on my home page.