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Strengths
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• Demonstrates efficacy of an intervention
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• Facilitates tailored approach based on context
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• Motivates widespread participation
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• Promotes careful attention to intervention protocol
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• Allows adjustment
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• Provides feedback regarding how and why interventions succeed or fail
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• Engages frontline expertise and increases likelihood of sustaining the intervention
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Weaknesses
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• Does not address contextual factors, except through exclusion criteria
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• Difficult to assess systematically and to conduct at scale
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• Does not address contextual factors
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