|
No � and that's okay. Diagnostic usability testing is a qualitative technique; it provides a rich, detailed understanding of how people use a product. We rely on face validity to rate the importance of a problem: if we see users struggling with something, and we can understand why they're struggling, we know we need to address the problem with a design change. While it is possible to reach statistical significance by using a larger sample to measure how many people in the overall population are likely to have the problem, we feel this requires a lot of additional time and money but provides minimal incremental benefit. While large sample sizes are usually not required for usability testing, projectiblity is important for other types of research questions. If you're interested in understanding who are the most frequent users of your product, or whether there's a market opportunity for a new concept, you might want to consider conducting a survey instead. |
