Organizational change is the process by which organizations move from their present state to a desired future state to increase effectiveness. Change can occur due to internal or external forces disturbing the organizational system. Characteristics of organizational change include it affecting people, structure, technology and other elements of the organization. Change can also affect the speed and significance of change within the organization. Resistance to change stems from individual, group and organizational levels and can be reduced through communication, training, and employee involvement. Perspectives for managing change include biological, rational, institutional, contingency, psychological, cultural, political, systems, postmodern, resource, and population ecology views.