Which types of evidence are acceptable to prove impact?

• A. Quantitative metrics
• B. Qualitative stories
• C. Before/after comparisons, letters of support, and video demonstrations
• D. Attendance lists only

Answer: (C)

Proof of impact comes from evidence that not only shows what changed, but also who witnessed that change and how it happened. Before/after comparisons clearly illustrate the actual change over time, giving a concrete measure of impact. Letters of support provide external validation from stakeholders who can attest that the project made a difference. Video demonstrations bring the results to life, letting judges see the outcomes, processes, and real-world applications in action. Together, these elements cover the amount of change, credible endorsement, and tangible demonstration, making the case strongest. Quantitative metrics alone can miss context, qualitative stories alone may lack measurable change, and attendance lists show reach but not impact; the combination of before/after evidence, external endorsements, and demonstrations addresses all three aspects of impact.