ISO 9001 is the world’s most widespread management standard: it sets requirements for a quality management system that ensures the organisation consistently delivers products and services meeting customer and regulatory requirements — and improves continuously.
The standard is built on process orientation, risk-based thinking and PDCA. Certification is done through accredited certification bodies with annual audits. The current version is ISO 9001:2015 (with Amendment 1:2024 on climate considerations); a major revision is under way with expected publication in 2026.
The pitfall is building the system for the auditor instead of for operations: a quality system that only lives in documents passes audits but prevents no defects.