Robert E. Stake developed the responsive evaluation model in 1967 which is based on the concerns of stakeholders being paramount. The evaluator meets with stakeholders to understand their perspectives and the program's purposes. They identify issues to evaluate and design evaluations to collect needed data, often using human observers. The evaluator then organizes the data into themes and portrays the findings in ways that communicate to stakeholders. A key advantage is sensitivity to stakeholder values and involving them, while a potential downside is clients manipulating concerns to avoid exposing weaknesses.