COR Advantage offers a free online course and two free online tests to help teachers use the system and assessment effectively.

The Inter-Rater Reliability, or IRR, tests allows teachers to check their scoring skills to ensure that they are selecting appropriate indicators for the COR items. COR 101 is our free, self-guided course available for teachers. After successful completion of any of these, you will receive a certificate of completion. 

You can access all of these here. 

HighScope hosts additional professional development courses, which you can learn about here.