How feedback affects small-group processes and group outcomes and how these outcomes vary with computer-assisted or experimenter-assisted modes of supplying feedback were investigated. Feedback theory was conceptualized through a work-emotionality framework. Theoretical constructs were operationalized through the use of Boyd's three-channel mode of communication. Experimental intervention resulted in increased perception of openness in the expression of feelings, increased interest in problem solving, improved decision-making procedures, and increased cooperation during experimentation. Groups that received feedback, both computer and experimenter-assisted, showed significant improvements in creativity and utilization of group resources. Computer-assisted feedback groups had a better short-term perception of improved cooperation and interest among group members and a greater short-term improvement in perception of decision-making procedures. In feedback groups work-emotionality activity changed in directions opposite to feedback instructions, that is, toward increased incongruency. Among the long-term effects observed in computer-assisted feedback groups were a decrease in perceived cooperation and a decrease in perceived interest in problem solving during post-experimental sessions. (Author/JY)