There are no perfect boards, but according to the 2017 National Index of Nonprofit Board Practices, Leading with Intent, boards that regularly assess their performance perform better in their core responsibilities. Who doesn’t want that?
Employee Performance Evaluation 
Assessing Performance and Needs of Cooperative Boards of Directors 
Is your Board Ready for Self Assessment 
Annual Evaluation of the Executive Director 
Nonprofit Capacity Self-Assessment workbook 
Board Evaluation Samples 
Appraisals Personal Reviews 
Successful Board Self-Assessments 
Self-Assessment Tool for Nonprofit Organizations 
Nonprofit Nonprofit Board Self-Assessment