An agency should have a policy or framework that applies to all evaluation work it does. This is a set of broad statements about the minimum requirements for each evaluation, regardless of diversity in the evaluands and evaluation objectives. A framework is a set of high-level standards.
This post describes seven groups of statements to guide planning a program evaluation. It can serve as the core of an evaluation policy for an agency. Brian Wolters at the Grand Rapids [Michigan] Center for Community Transformation worked with me to develop the statements.
As always, constructive criticism and suggestions are welcome.