The Impact Score is derived from the target population, not experts, and is used to measure how important and noticeable an item is in practice. By combining ratings of importance and frequency, the score highlights which items are truly valued by respondents. Items with higher impact scores are more likely to resonate with participants, ensuring the tool is relevant and understandable from the user’s perspective. This measure adds a practical layer of validation, often referred to as face validity. While it does not rely on statistical tests alone, it ensures that the tool “makes sense” to those who will actually use it. Incorporating items with strong impact scores enhances the instrument’s usability, cultural fit, and acceptance, making it more effective in real-world applications.
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