Organizational culture influences human behavior through beliefs, customs and practices. There are visible and invisible levels of culture. Power in organizations comes in seven types including coercive, connection, expert, information, legitimate, referent, and reward power. Organizational change can be planned or unplanned and is driven by external forces like technology or internal forces like management changes. Resistance to change comes from individuals fearing loss or disruption, and from organizations facing resource constraints or threats to expertise. Managing resistance involves communication, participation, support, and sometimes manipulation. Organizational development is a planned approach to improve effectiveness through interventions in processes and structures impacting employees.