Individuals may test or rebel against the leader's policies in Tuckman's stage of group development. (Enter one word in the blank.)

The word that fits in the blank is "storming."

In Tuckman's stages of group development, the "storming" stage is characterized by conflict and competition as group members begin to push against the boundaries established in the "forming" stage. During this phase, individuals may test or rebel against the leader's policies and the group's norms. This can involve disagreement over tasks, roles, and responsibilities, which can lead to tension and challenges in group dynamics. However, this stage is crucial because it encourages open communication and conflict resolution, allowing the group to develop stronger relationships and ultimately move toward the "norming" stage, where collaboration and cohesiveness are enhanced.