Tuckman's fifth stage is the break-up of the group when the task is completed successfully.

The statement is correct. In 1977, Bruce Tuckman and Mary Ann Jensen updated the original four-stage model (Forming, Storming, Norming, Performing) to include a fifth stage: "Adjourning." This stage addresses the end of a group's life cycle. It is characterized by the termination of tasks and the disengagement of group members as the project is completed or the group's purpose has been fulfilled. This process is often referred to as the "break-up" or mourning stage, where the group dissolves after successfully completing its objectives.

B. False: This is incorrect. The statement accurately describes the fifth stage, "Adjourning," which was formally added to Tuckman's model to represent the completion and dissolution phase of a group.

1. Tuckman, B. W., & Jensen, M. A. C. (1977). Stages of small-group development revisited. Group & Organization Studies, 2(4), 419–427. In this seminal paper, the authors introduce the fifth stage, stating, "In the fifth stage, Adjourning, the group experiences issues of termination... and the group disbands" (p. 426). DOI: https://doi.org/10.1177/105960117700200404

2. MIT Human Resources. (n.d.). Leading Teams: Tuckman's Stages of Group Development. Massachusetts Institute of Technology. Retrieved from https://hr.mit.edu/learning-topics/teams/articles/stages-development. This university resource describes the Adjourning stage: "The team has achieved its purpose and it is now time for the team to disband... This final stage is for the team to celebrate what they have achieved together." This aligns with the concept of task completion and group break-up.