Focus groups: Theory and practice, 2nd ed.

By David W. Stewart, Prem Shamdasani, Dennis W. Rook. 2007

1,200 citations recorded by the source corpus.

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What about N? A methodological study of sample-size reporting in focus group studies (2011, background): “Stewart et al. (2007) observed that rarely are more than 3-4 focus groups conducted in the social sciences.”
Collaboration and Productivity in Scientific Synthesis (2011, background): “For instance, more dominant individuals tend to choose more central seats, leading them to dominate conversations (Hare and Bales 1963, Stewart et al. 2007).”
Defining and characterizing team resilience in elite sport (2013, methodology): “22 Interview Guide 23 Due to the exploratory nature of the study, a semi-structured interview guide was 24 designed to facilitate a flexible interview format (Liamputtong, 2011; Stewart et al., 2007).”
Intergroup and Within-Group Perceived Discrimination Among U.S.-Born and Foreign-Born Latino Youth (2010, background): “Last, participants were given a choice to attend either a Spanish or English language group based on their own feeling of comfort (Stewart et al., 2007; Umaña-Taylor & Bámaca, 2004).”
Customer Response to Carbon Labelling of Groceries (2011, background): “Several limitations and biases are known to occur with focus groups (Stewart et al. 2007), so this study examines purchasing preferences in a non-intrusive way by monitoring sales records recorded at point-of-sale.”