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Descriptive designs are the most common designs in evaluation and serve many useful purposes

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Descriptive designs are the most common designs in evaluation and serve many useful purposes. Cross-sectional designs provide useful quantitative information on large numbers of individuals and groups. Case studies are invaluable for exploring issues in depth, providing thick descriptions of programs in implementation, different outcomes, contextual issues, and needs and perspectives of various stakeholders. Time-series designs are effective in describing changes over time.