A practical guide to choosing and using templates that support a secure product development lifecycle under IEC 62443-4-1:2018.
From the standard to usable evidence
IEC 62443-4-1:2018 specifies process requirements for the secure development of products used in industrial automation and control systems. It applies to developers and maintainers of hardware, software and firmware products, and can be applied to new or existing development, maintenance and retirement processes.
Templates can help turn those processes into repeatable work. A useful set may include process descriptions and editable records for security requirements, secure design, implementation, verification and validation, security-related issues, updates, product end-of-life or retirement, and user-facing security guidance.
The value of a package is not simply the number of documents it contains. What matters is whether teams can adapt it to their own development arrangements and use it to connect activities, accountable owners, records and review evidence.
The lifecycle areas to cover
IEC 62443-4-1:2018 organises its requirements into eight practices. A template architecture should consider the practices that are relevant to the organisation's scope:
| Practice | What templates may help structure |
|---|---|
| Security management | Roles, responsibilities, governance and process records |
| Specification of security requirements | Security requirements, assumptions and traceability |
| Secure by design | Architecture, design decisions and security reviews |
| Secure implementation | Implementation activities and supporting controls |
| Security verification and validation testing | Test planning, results, findings and approvals |
| Management of security-related issues | Issue recording, assessment, resolution and communication |
| Security update management | Update decisions, release records and maintenance activities |
| Security guidelines | Product security information for users |
A package should be assessed against the complete relevant lifecycle, including product end-of-life or retirement activities and records, rather than focusing only on design and testing.
Questions to ask when evaluating templates
Consider the following questions before selecting or adopting a template set:
- Does it cover the practices that are relevant to the product development scope?
- Does it include editable working documents and understandable examples, rather than only a process overview?
- Can teams trace security requirements through activities, decisions, records and review evidence?
- Can the material be integrated into established quality, development and change-management processes?
- Are version control, maintenance and responsibility for completed artefacts defined?
- Can the templates be adapted without obscuring the organisation's actual way of working?
The answers will differ by product, organisation and development model. The organisation still needs to determine its own scope and applicability, then tailor the documents to its products and working practices.
Documents are not an operating lifecycle
Templates are a starting point, not proof that a secure development lifecycle is in place. They become useful only when the relevant processes are performed, the resulting evidence is maintained and the records reflect how work was actually carried out.
This distinction also matters for assessment and certification. ISASecure's SDLA certification scheme assesses a documented secure development lifecycle and evidence that it is followed. Owning a set of templates alone does not demonstrate implementation or guarantee certification.
A controlled template system can therefore provide a practical foundation: it helps teams make responsibilities, activities and evidence visible. It does not replace organisation-specific decisions, active process management or the ongoing maintenance of the lifecycle records.