Project team development models are essential frameworks within the PMBOK 7 for guiding the growth and effectiveness of project teams. These models provide structured approaches to fostering team collaboration, enhancing communication, and developing the necessary skills for achieving project objectives. One widely recognized model is Tuckman's Stages of Group Development, which outlines four phases: forming, storming, norming, and performing. In the forming stage, team members are introduced, and roles and responsibilities are defined. The storming stage involves addressing conflicts and establishing workflows as members negotiate their roles. Norming sees the team developing cohesion, agreeing on processes, and building trust. Finally, in the performing stage, the team operates efficiently towards project goals with minimal friction. Another model is the Belbin Team Roles, which identifies nine distinct roles individuals may assume within a team, such as coordinator, implementer, and plant. Understanding these roles helps in assigning tasks that align with team members' strengths, thereby enhancing productivity. Additionally, the GRPI Model (Goals, Roles, Processes, and Interpersonal Relationships) focuses on clarifying team objectives, defining roles, establishing processes, and fostering positive relationships to ensure effective teamwork. In the context of PMBOK 7, these development models are integrated into the team management practices to ensure that project teams are not only well-structured but also adaptive to changes and challenges. Effective team development leads to improved performance, higher morale, and greater project success rates. Project managers utilize these models to diagnose team dynamics, implement strategies for improvement, and maintain a motivated and competent team throughout the project lifecycle. By leveraging such models, PMBOK 7 emphasizes the importance of human factors in project management, recognizing that a well-developed team is critical to delivering successful project outcomes.