Existing definitions and models of systems change are reviewed, and practical challenges of systems change evaluation will be discussed. Meta-evaluation information will be used to identify the kinds of changes that occur when systems change efforts have been successful.Finally, efforts to assess within the context of ongoing systems change evaluation projects are discussed, and the use of a new assessment tool is introduced. Information from the fields of developmental disabilities, education, and substance abuse will be used as examples#ResearchonEvaluation #Systems #2009Conference #SystemsinEvaluation #Evaluation2009 #TheoriesofEvaluation #Change #efforts #HowTo #evaluating