A.5.25
    Organizational Controls

    Assessment and decision on information security events

    The organization should assess information security events and decide if they are to be categorized as information security incidents.

    Purpose

    To ensure consistent evaluation and appropriate response to security events.

    Implementation Guidance

    Define criteria for classifying events as incidents

    Establish triage procedures for security events

    Document decision-making processes and outcomes

    Maintain logs of all security events and assessments

    Train personnel on event classification

    Recommended Tools

    ISO 27001 Services from the Directory

    These providers can help you implement A.5.25 and achieve ISO 27001 certification.

    Advisera logo

    Advisera

    Provider of ISO 27001 documentation, training, and consultancy services to help businesses achieve compliance.

    Anecdotes logo

    Anecdotes

    Enterprise agentic GRC platform with 230+ integrations and 40+ pre-mapped frameworks for Fortune 500 compliance programs.

    Arrow Cyber Advisors logo

    Arrow Cyber Advisors

    Arrow Cyber Advisors enables organizations to build measurable cybersecurity maturity and resilience. We specialize in governance, risk and compliance advisory, providing clear security direction, maturity benchmarking, and execution support tailored to regulated and high-risk environments.

    Atoro logo

    Atoro

    Atoro offers specialized ISO 27001 certification services for SaaS companies, simplifying compliance with expert tools.

    AuditBoard logo

    AuditBoard

    Enterprise connected risk platform trusted by over 50% of the Fortune 500 for audit, risk, and compliance management.

    Auro Security logo

    Auro Security

    Most modern product teams, including SaaS, FinTech and cloud-native startups are moving fast, building with AI, and operating in an environment where enterprise buyers, regulators, and investors expect real security. Auro Security exists to help those teams get there. Operating across India and the Middle East, we work with founders, CTOs, and compliance leads to build security programs that hold up under scrutiny, not just on paper. What We Do We offer a focused suite of cybersecurity services: - SOC 2 and ISO 27001 Compliance: End-to-end audit readiness, gap assessments, policy creation, evidence collection support, and continuous monitoring. - VAPT (Vulnerability Assessment and Penetration Testing): Deep technical testing for web apps, mobile apps, APIs, cloud infrastructure, and networks to uncover risks before attackers do. - vCISO Services: Fractional cybersecurity leadership to help you build a security roadmap, manage risk, and meet enterprise expectations as you scale. Who We Serve We primarily work with: SaaS companies and cloud-native startups, FinTech and payments platforms, early-stage teams preparing for enterprise sales or compliance audits.

    By the team behind ISMS Directory

    Implementing A.5.25 for a client?

    ISMS Copilot drafts policies, evidence, and SoA wording for A.5.25 Assessment and decision on information security events. Built for compliance professionals.

    Try ISMS Copilot free