A quality management system is a common sense, well documented system that ensures consistency and improvement of working practices, including the products and services produced.
They are based on standards, which specify requirements for achieving effective quality management.
ISO 9001 is the most commonly used international standard that provides a framework for a quality management system.
QMS consists of:

1. Quality Policy

2. Quality Objectives

3. Quality Manual which addresses the requirements of the Standard

4. Procedures Manual

5. Work Instructions

6. Formats

7. Controlled documents

8. Records

9. Internal Quality Audits

10. Management Review Meetings against the agenda specified by the standard