Organization development (OD) is defined as a long-term, collaborative effort led by top management to improve an organization's vision, empowerment, learning, and problem-solving processes through managing organizational culture. The key characteristics of OD include a focus on culture and processes, collaboration between leaders and members, the importance of teams, and a focus on the human and social aspects of the organization. OD practitioners act as facilitators and help organizations solve problems on their own through action research and skills development. The assumptions of OD include that individuals want growth, groups are important reference points, and people-centered organizations can be both effective and empowering. Common OD interventions include team building, process consultation, and restructuring formal organizational structures.