Continuous improvement is a core principle of ISO 27001 that requires organisations to systematically enhance their information security management system (ISMS) over time. It follows the Plan-Do-Check-Act (PDCA) cycle: planning security measures, implementing them, monitoring their effectiveness and taking corrective action based on findings.
The requirement for continuous improvement ensures that an ISMS remains effective as the threat landscape, business context and regulatory environment evolve. Organisations demonstrate continuous improvement through management reviews, internal audits, corrective actions, updated risk assessments and measurable security objectives. Certification bodies evaluate the maturity of an organisation's improvement process during surveillance and recertification audits.