5 Pillars of ISO9001

ISO9001 has five main pillars.

First pillar is Clause 4 Quality Management System. This is the main pillar or Center Pillar. It entails the general requirements, documented QMS, scope and exclusions, control of documents, and control of records.

Second pillar is Management Responsibility. This is the North Pillar, and associated with "Act" in PDCA cycle.

Third pillar is Resource Management. This is the East Pillar which is related to "Plan" in PDCA cycle.

Fourth pillar is Product Realization. This is the South Pillar, the "Do" in PDCA cycle.

Fift pillar is Measurement, Analysis and Improvement. This is the West Pillar, and associated with the "Check" in PDCA cycle.