This article describes a model for supervisors of group counselors to use to promote cognitive complexity in their supervisees. Counselor cognitive complexity has been linked to many positive counseling skills, including greater flexibility, empathy, confidence, and client conceptualization. Bloom's Taxonomy of Educational Objectives provides a mechanism to help supervisors encourage the growth of cognitive complexity in their supervisees. Applied to supervisees learning group work, this model can help guide supervisors to use interventions that match the cognitive developmental level of the supervisee and push the supervisee toward higher levels of thinking. Examples for interventions that match trainee cognitive complexity and stage of group are included.