Reviewing and Extending the Five-User Assumption: A Grounded Procedure for Interaction Evaluation

  title={Reviewing and Extending the Five-User Assumption: A Grounded Procedure for Interaction Evaluation},
  author={Simone Borsci and Robert D. Macredie and Julie Barnett and Jennifer L. Martin and Jasna Kuljis and Terry Young},
  journal={ACM Trans. Comput.-Hum. Interact.},
The debate concerning how many participants represents a sufficient number for interaction testing is well-established and long-running, with prominent contributions arguing that five users provide a good benchmark when seeking to discover interaction problems. We argue that adoption of five users in this context is often done with little understanding of the basis for, or implications of, the decision. We present an analysis of relevant research to clarify the meaning of the five-user… CONTINUE READING
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