Participation of workers or clients in decision-making has been suggested as a critical method for achieving acceptance and effectiveness of planned change (Blumberg, 1976). The literature does not provide full support for this suggestion (Locke & Schweiger, 1979; Wagner & Gooding, 1987). The present study investigated the type of change decision and change certainty, which may moderate the effect of participation on change acceptance. A battery of psychological ability tests was administered to 222 Israeli subjects participating in a laboratory experiment. Subjects in three experimental groups were offered an opportunity to participate in strategic and/or tactical decisions regarding a change in type of test. The fourth group was not given any chance for participation. The effect of participation upon acceptance of change was consistent with the proposed hypotheses.