Organization Development is an effort planned, organization-wide, and managed from the top, to increase organization effectiveness and health through planned interventions in the organization's 'processes,' using behavioral-science knowledge.
OD interventions are the building blocks which are the planned activities designed to improve the organisation’s functioning through the participation of the organisational members. OD innervations include team development, laboratory training, managerial grid training, brainstorming and intergroup team building.
Planned change or developmental change is undertaken to improve the current way of operating. It is a calculated change, initiated to achieve a certain desirable output/performance and to make the organization more responsive to internal and external demands.