The ‘repertory grid’ and the ‘implication grid’ techniques are compared using criteria based on an indirect measure of construct matching scores. The implication grid proved superior to the repertory grid under conditions designed to compare stability of matching scores and under conditions designed to compare sensitivity to subjects' changes in construing. The significance of a further result, that the implication grid was superior for reflecting construct bipolarity, is considered in the light of conceptual problems with an assumption of bipolarity. The set of results is especially noteworthy since ‘indirect’ measures were formerly the exclusive province of the repertory grid. The discussion raises general issues about the relative utility of two grid formats, and the unique measurement possibilities of the implication grid are illustrated. It is concluded that the’ implication grid deserves careful consideration for use in studies concerned only with construct relationships.
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Terry Honess (1978) studied this question.