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Family Practice Vol. 12, No. 4, 474-475
© Oxford University Press 1995

other

Critical factors in the determination of focus group size

Kwok Cho Tang and Alan Davis*

South Eastern Sydney Area Health Service, c/o Community Resource Centre Sutherland Hospital, Caringbah, New South Wales, Australia 2229
*Department of Social Work and Social Policy, University of Sydney Sydney, Australia KC Tang is an Honorary Visiting Fellow, School of Community Medicine, University of New South Wales NSW, Australia

From a theoretical perspective, it is difficult to decide an optimal number of participants that should be included in a focus group. Despite recent attempts, critical factors for the determination of the size of a focus group remain uncertain and can further be elaborated. From a practical perspective, this paper proposes four other factors that can be used for the determination of focus group size. These are: the number of questions asked, the allotted time for each question, the format of the focus group session and the duration of the session. Above all, the size of a group should first be determined by the aims of the research study.


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