Tom Tullis and Larry Wood
Usability Professionals Association (UPA) 2004 Conference, Minneapolis, MN, 2004
Publication year: 2004

A study was conducted to assess the minimum number of participants needed for a card-sorting study. Similarity matrices and tree structures from various sample sizes were compared to those based on a set of 168 participants. Results indicate that reasonable structures are obtained from 20-30 participants.

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