What is the differences between development management and quality management?

The difference between development management and quality management lies within the specific scope and the goal of each job function.

Development management focus on the development activities and the deliverables in a project such as Concept/Initiate, Plan, Develop, Validate, Release/completion. It's goal is to complete all these stages/phases of the project within the project's budget and schedule.  

While quality management focus on the QUALITY and RELIABILITY of the product, project's execution and its outcome, documentations (quality records), adherence to procedures and policies, sustaining quality and its continuous improvement. Quality management can be applied during a new product development, projects, production, and operations. It's goal is to ensure that the project and its outcome adheres to the standards, specifications that satifies and delight the customer's expectations and mostly, to ensure that such state is maintained during the product's life cycle. 

The fundamental differences between Total Quality Management and Management by Objectives relate to the scope. TQM is wide in scope and extends to reducing defects, eliminating waste, and improving quality throughout all processes in the organization, for long-term benefits.

Quality management is the group of business processes that is designed to focus on meeting customer requirements and ensure their satisfactions While development management is a systematic process which aims to ensure that the organization has the effective managers it requires to meet its present and future needs.

Quality Management is the assembly and management of all activities aimed at the production of quality by organizations of various kinds. In the present case this implies the introduction and proper running of a "Quality System" in laboratories. A statement of objectives and policy to produce quality should be made for the organization or department concerned (by the institute's directorate). This statement also identifies the internal organization and responsibilities for the effective operation of the Quality System.