Briefly explain the different organizational development techniques that are employed by organizations to increase overall performance.

Answers will vary. Organizational development (OD) is a system-wide effort, managed from the top of the organization, to increase the organization's overall performance through planned interventions. Different OD techniques are widely used.
Survey feedback: Survey feedback involves having employees respond to questionnaires about attitudes and perceptions of leadership styles and then sharing the results of the survey with everyone involved, including managers and supervisors. The purpose is to change the behavior of managers or supervisors by making them aware of how everyone perceives them. Following the feedback are usually workshops designed to help managers evaluate the feedback and suggest constructive changes.
Third-party peacemaking: When OD is undertaken to solve a specific problem, such as interpersonal conflict, techniques such as third-party peacemaking might be used. Here a neutral third party, often an OD consultant from outside the organization, hears both sides in a conflict. He or she then helps the parties develop satisfactory solutions or compromises so that everyone can win.
Process consultation: In process consultation, the OD consultant observes managers in the organization to develop an understanding of their communication patterns, decision-making and leadership processes, and methods of cooperation and conflict resolution. The consultant then provides feedback and recommendations to the managers about how to improve these procedures.