What is the primary objective of **ISO 37301**?

**ISO 37301:2021 specifies requirements for establishing, implementing, maintaining, and improving an effective **Compliance Management System (CMS)**.** Published on 13 April 2021, it replaces the guidance-only ISO 19600 by introducing certifiable 'shall' requirements using the Plan-Do-Check-Act (PDCA) cycle and High-Level Structure (HLS). The standard promotes a risk-based approach to identify **compliance obligations**, assess risks/opportunities, embed a compliance culture, and ensure continual improvement through leadership commitment, whistleblower protections, and performance evaluation.

Who is legally or professionally required to comply with **ISO 37301**?

**No organization is legally required to comply with ISO 37301, as it is a voluntary, certifiable standard applicable to all sizes, types, and sectors.** It is professionally adopted by organizations seeking third-party certification to demonstrate systematic management of **compliance obligations** (legal, regulatory, contractual, voluntary). Large enterprises like Kingspan have certified multiple sites, driven by regulatory complexity, investor demands, and reputational risk; SMEs can apply it proportionally without certification.

Does **ISO 37301** require an external audit or third-party certification?

**ISO 37301 does not require external audit or third-party certification, but enables it through accredited bodies like those under ANAB.** Certification involves initial conformity assessment followed by surveillance audits in a typical three-year cycle. Organizations must maintain documented evidence of internal audits, management reviews, and performance metrics for certification readiness.

How often should an assessment for **ISO 37301** be performed?

**ISO 37301 requires continual performance evaluation, including internal audits at planned intervals based on risk, status, and results.** **Top management** must conduct management reviews at planned intervals, using inputs like KPIs, audit findings, incidents, and resource adequacy. This supports the PDCA cycle, with surveillance audits every 1-2 years post-certification in standard practice.

What are the consequences of non-compliance with **ISO 37301**?

**Non-conformance with ISO 37301 results in loss of certification, not legal penalties, as it is voluntary.** Certified organizations face major nonconformities leading to corrective actions, potential suspension, or withdrawal by accredited bodies. Internally, it risks inadequate CMS performance, heightened exposure to regulatory fines, litigation, or reputational damage from unaddressed **compliance obligations**.

An **ISO 37301** be mapped to other international frameworks?

**Yes, ISO 37301 follows the High-Level Structure (HLS), enabling seamless mapping and integration with other ISO management system standards.** Its PDCA cycle and clauses (context, leadership, planning, support, operation, evaluation, improvement) align for Integrated Management Systems (IMS), reducing duplication in audits and processes.

What is the first step to begin implementing **ISO 37301**?

**The first step is to determine the organization's context, identifying internal/external issues, interested parties, and scope of the CMS.** Secure **top management** buy-in, then inventory **compliance obligations** into a centralized register, prioritizing material risks per the risk-based approach.

What is the primary objective of **IEC 62443**?

**IEC 62443 defines requirements and processes for implementing and maintaining cybersecurity in Industrial Automation and Control Systems (IACS).** The series establishes a shared-responsibility framework across asset owners, system integrators, and product suppliers, using zones/conduits, security levels (SL 0–4), and foundational requirements (FR 1–7: IAC, UC, SI, DC, RDF, TRE, RA) to achieve risk-based protection throughout the IACS lifecycle.

Who is legally or professionally required to comply with **IEC 62443**?

**IEC 62443 applies to all stakeholders in IACS environments, including asset owners, system integrators/service providers, and product suppliers.** Asset owners establish security programs per IEC 62443-2-1; integrators meet system requirements (IEC 62443-3-3, -2-4); suppliers adhere to secure development (IEC 62443-4-1) and component requirements (IEC 62443-4-2). As a horizontal IEC standard, it is professionally required across sectors like energy, manufacturing, and utilities.

Oes **IEC 62443** require an external audit or third-party certification?

**IEC 62443 does not mandate external audits or certification but supports them via ISASecure schemes.** Modular certifications include SDLA (IEC 62443-4-1 processes, ML1–ML4 maturity), CSA (IEC 62443-4-2 components), and SSA (IEC 62443-3-3 systems), performed by ISO/IEC 17065-accredited bodies with multi-stage audits for verifiable SL-C assurance.

How often should an assessment for **IEC 62443** be performed?

**IEC 62443 assessments should occur initially, then periodically via the CSMS continuous improvement cycle in IEC 62443-2-1.** Risk assessments (IEC 62443-3-2) are conducted for new systems or changes, with maturity reviews (ML1–ML4) annually; surveillance audits for certifications occur yearly, full re-certification every three years.

What are the consequences of non-compliance with **IEC 62443**?

**Non-compliance with IEC 62443 exposes organizations to operational disruptions, safety incidents, and supply chain risks in IACS.** It undermines SL-T achievement, leading to unverified SL-A, potential vendor disqualification, increased cyber insurance costs, and regulatory scrutiny as a recognized horizontal baseline for critical infrastructure.

An **IEC 62443** be mapped to other international frameworks?

**Yes, IEC 62443 maps to other frameworks via its foundational requirements and security levels.** The 2024 IEC 62443-2-1 update provides explicit mappings from Security Program Elements (SPE) to system requirements (SRs in 3-3) and component requirements (CRs in 4-2), enabling traceability for integrated compliance programs.

What is the first step to begin implementing **IEC 62443**?

**The first step is establishing an IACS security program per IEC 62443-2-1, including CSMS governance and asset inventory.** Define the System Under Consideration (SUC), conduct initial risk assessment (IEC 62443-3-2) for zones/conduits/SL-T, and produce a gap analysis against ~127 CSMS requirements for prioritized roadmap.

ISO 37301 vs IEC 62443

Standards Comparison

ISO 37301

Voluntary

2021

International certifiable standard for compliance management systems

IEC 62443

Voluntary

2018

International standard for IACS cybersecurity

Quick Verdict

ISO 37301 establishes certifiable compliance management systems for all organizations, while IEC 62443 delivers OT-specific cybersecurity via zones, security levels, and supplier assurances. Companies adopt them for governance, risk reduction, and third-party validation.

Compliance Management

ISO 37301

ISO 37301:2021 Compliance management systems – Requirements with guidance

Cost

€€€€

Complexity

High

Implementation Time

12-18 months

Key Features

Certifiable requirements replacing guidance-only ISO 19600
High-Level Structure for IMS integration alignment
Top management commitment and compliance culture mandate
Risk-based obligations assessment and controls planning
Confidential whistleblowing channels with anti-retaliation protections

Industrial Cybersecurity

IEC 62443

IEC 62443: IACS Security Standards Series

Cost

€€€€

Complexity

High

Implementation Time

18-24 months

Key Features

Zones and conduits risk-based segmentation
Security levels SL-T, SL-C, SL-A triad
Shared responsibility across stakeholders
Seven foundational requirements FR1-7
ISASecure modular certifications SDLA/CSA/SSA

Detailed Analysis

A comprehensive look at the specific requirements, scope, and impact of each standard.

ISO 37301 Details

What It Is

ISO 37301:2021, titled Compliance management systems – Requirements with guidance for use, is a certifiable international standard for establishing, implementing, and improving Compliance Management Systems (CMS). It applies a risk-based, PDCA-cycle approach using the ISO High-Level Structure (HLS) to manage legal, regulatory, contractual, and voluntary obligations systematically.

Key Components

**LeadershipTop management commitment, policy, roles, culture.
**PlanningRisk assessment, obligations register, objectives.
**SupportResources, competence (per ISO 37303), awareness, whistleblowing.
**OperationControls, third-party management, investigations.
**EvaluationMonitoring, KPIs, audits, management reviews (ISO 37302 guidance).
**ImprovementCorrective actions, continual enhancement. Features ~40 pages of auditable requirements.

Why Organizations Use It

Drives certification for stakeholder trust, reduces fines/reputation risks, supports ESG/SDGs, integrates with ISO 9001/14001/27001. Meets investor demands, enhances resilience amid regulatory complexity.

Implementation Overview

Phased: context analysis, risk planning, controls/training, audits/certification via accredited bodies (e.g., ANAB, 3-year cycles). Scalable for all sizes/sectors; integrates easily with IMS.

IEC 62443 Details

What It Is

IEC 62443 is the international consensus-based standards series for cybersecurity in Industrial Automation and Control Systems (IACS). It addresses OT environments with a risk-based framework spanning governance, architecture, technical requirements, and supplier practices, using zones/conduits and security levels (SL 0–4).

Key Components

Four groupings: General (-1), Policies (-2), System (-3), Components (-4)
Seven **Foundational Requirements (FR 1–7)IAC, UC, SI, DC, RDF, TRE, RA
SL-T (target), SL-C (capability), SL-A (achieved)
ISASecure certifications: SDLA (4-1), CSA (4-2), SSA (3-3)

Why Organizations Use It

Reduces OT cyber risks impacting safety/availability
Meets regulatory references, supply chain demands
Enables secure IIoT modernization
Builds supplier trust via certifications

Implementation Overview

Phased: CSMS (2-1), risk assessment (3-2), controls (3-3/4-2)
For asset owners, integrators, suppliers globally
Optional audits/certifications via ISASecure

Key Differences

Aspect	ISO 37301	IEC 62443
Scope	Compliance management systems (CMS) across all obligations	IACS/OT cybersecurity, zones, security levels
Industry	All sectors, sizes, global applicability	Industrial automation, critical infrastructure, OT-focused
Nature	Certifiable management system standard, voluntary	Technical cybersecurity standards series, voluntary
Testing	Internal audits, management reviews, certification audits	Risk assessments, SL validation, ISASecure certifications
Penalties	Loss of certification, no legal penalties	No legal penalties, certification withdrawal

Scope

ISO 37301

Compliance management systems (CMS) across all obligations

IEC 62443

IACS/OT cybersecurity, zones, security levels

Industry

ISO 37301

All sectors, sizes, global applicability

IEC 62443

Industrial automation, critical infrastructure, OT-focused

Nature

ISO 37301

Certifiable management system standard, voluntary

IEC 62443

Technical cybersecurity standards series, voluntary

Testing

ISO 37301

Internal audits, management reviews, certification audits

IEC 62443

Risk assessments, SL validation, ISASecure certifications

Penalties

ISO 37301

Loss of certification, no legal penalties

IEC 62443

No legal penalties, certification withdrawal

Frequently Asked Questions

Common questions about ISO 37301 and IEC 62443

ISO 37301 FAQ

IEC 62443 FAQ

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ISO 37301

IEC 62443

Quick Verdict

ISO 37301

Key Features

IEC 62443

Key Features

Detailed Analysis

ISO 37301 Details

What It Is

Key Components

Why Organizations Use It

Implementation Overview

IEC 62443 Details

What It Is

Key Components

Why Organizations Use It

Implementation Overview

Key Differences

Scope

Industry

Nature

Testing

Penalties

Frequently Asked Questions

ISO 37301 FAQ

What is the primary objective of ISO 37301?

Who is legally or professionally required to comply with ISO 37301?

Does ISO 37301 require an external audit or third-party certification?

How often should an assessment for ISO 37301 be performed?

What are the consequences of non-compliance with ISO 37301?

An ISO 37301 be mapped to other international frameworks?

What is the first step to begin implementing ISO 37301?

IEC 62443 FAQ

What is the primary objective of IEC 62443?

Who is legally or professionally required to comply with IEC 62443?

Oes IEC 62443 require an external audit or third-party certification?

How often should an assessment for IEC 62443 be performed?

What are the consequences of non-compliance with IEC 62443?

An IEC 62443 be mapped to other international frameworks?

What is the first step to begin implementing IEC 62443?

You Might also be Interested in These Articles...

SOC 2 Trust Services Criteria in Plain English: Side-by-Side Decoder for Security, Availability, and Beyond

From Data Fragments to Strategic Insight: Powering Intelligent Risk Management with Integrated Compliance Monitoring

Using CIS Controls v8.1 as a ‘Compliance On-Ramp’: Map One Security Program to NIST CSF, ISO 27001, PCI DSS, and NIS2

Run Maturity Assessments with GRADUM

Check out these other Gradum.io Standards Comparison Pages

IFS Food vs ISO 27018

FedRAMP vs ISO 27018

ISA 95 vs CSA