For 40 years researchers have studied minimal groups using a variety of induction procedures which, surprisingly, have never been formally evaluated. This article reports two experiments that compared minimal group induction procedures based on: (1) memorization of novel ingroup names; (2) an imagination instruction; (3) random assignment; and (4) false feedback from painting preferences. The memorization procedure produced the largest ingroup favoritism effects on implicit measures of attraction and identification, whereas all procedures produced comparable ingroup favoritism effects on explicit measures of attraction and identification and bonus money allocation. The memorization procedure is recommended as a practical and effective minimal group induction procedure, particularly in cases in which implicit assessments are of primary interest.
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