Periodic performance evaluations may cause more apprehension for corporate boards than any other issue — particularly when they involve an assessment of individual directors by their peers. Many board members fear that peer-to-peer evaluations can threaten the collegiality of the board, particularly if it’s seen as a veiled strategy for removing unpopular directors from their seats. And yet when used appropriately, evaluations can be an effective tool to improve the performance of individual directors as well as the entire board. It can also serve to hold directors accountable for their contributions and participation while providing valuable feedback. Practices vary among...