The Group Activity Form: is it Valid and Reliable?

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The Group Activity Form (GAF; expanded from Bender et al 1987), a tool for evaluating group members' participation in group sessions, has been successfully used, but its reliability and validity have not been established. This was the aim of the present study.

In order to investigate the interrater reliability of the GAF, three independent raters used the GAF to score 96 people with dementia attending a reminiscence group. The group was conducted by the occupational therapy department in an assessment ward for people with dementia. To explore the concurrent validity of the GAF, it was hypothesised that, with this client group, a correlation could be expected between how successful the group members were in engaging in group activity, measured by the GAF, and their cognitive abilities. To measure the latter, the Clifton Assessment Procedure for the Elderly (CAPE; Pattie and Gilleard 1979), a measure well established and validated in this setting, was used.

The results showed a significant interrater reliability on all the items of the GAF. There was some evidence for the hypothesised correlation between the GAF and the CAPE. This study is a useful starting point for further research to investigate other aspects of the validity and reliability of the GAF.

Document Type: Research Article

Publication date: June 1, 2002

More about this publication?
  • The British Journal of Occupational Therapy (BJOT) is the official journal of the College of Occupational Therapists. Its purpose is to publish articles relevant to theory, practice, research, education and management in occupational therapy internationally.

    BJOT publishes research articles, critical reviews, practice analyses, opinion pieces, editorials, letters to the editor, book reviews and an annual index. Please refer to the author's guide at

    Submissions can be made at

    The 2013 Impact Factor for The British Journal of Occupational Therapy is 0.897.

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