Most software companies don't "just" need ISO 27001. They need ISO 27001 plus something else: GDPR, SOC 2, NIS2, customer security questionnaires, industry requirements, or internal governance frameworks. Volume 4 shows how to design one security system that satisfies multiple obligations without duplicating work or fragmenting evidence.

What you'll get:
- Mapping + harmonization patterns ("control reuse"): one control, many outputs
- Stable control library + evidence model that scales across audits and frameworks
- Guidance on overlapping domains (access control, vendor risk, incidents, data protection, secure development)
- Exception handling + compensating controls without breaking governance coherence
- Strategy: what to certify vs. attest, sequencing audits, avoiding recurring last‑minute chaos

What it helps you produce: a single control system and evidence baseline that supports multiple audiences — auditors, regulators, customers, and procurement.

Typical questions this volume answers:
- How do we map ISO 27001 controls to GDPR/SOC 2/NIS2 without creating duplicate work?
- What should be "one global control" vs. "framework-specific add-on"?
- How do we handle exceptions and compensating controls without undermining governance?
- What's a sane sequencing strategy for certifications/attestations in a scaling company?

Who it's for: teams facing multi-framework reality (customers, regulators, enterprise procurement) that want to reduce compliance overhead while improving security consistency.