This How-To Note addresses key issues for USAID staff who are developing a Statement of Work for an externally contracted evaluation. Following these practices will help to establish clear expectations and requirements for the evaluation team. These practices also serve as a guide for reviewing the quality of evaluation statements of work for internal peer review processes. While the information in this Note is applicable to both performance and impact evaluation, the complexity of an impact evaluation and multi-stage evaluations will be addressed with additional guidance for SOW development.