Technical Documentation — EU AI Act Annex IV Requirements

Definition

Technical documentation, in the context of the EU AI Act, refers to the comprehensive set of documents that providers of high-risk AI systems must prepare and maintain before placing a system on the market or putting it into service. The minimum content of the technical documentation is defined in Annex IV of the regulation and constitutes the primary evidence artifact for conformity assessments, notified body evaluations, and market surveillance authority inspections.

Annex IV specifies that the technical documentation must include: a general description of the AI system and its intended purpose; a detailed description of the system’s elements and their development process (data, training methodology, architecture); information about the monitoring, functioning, and control of the system; a description of the risk management system; changes to the system over its lifecycle; an assessment of human oversight measures; a description of performance validation and testing; and, where applicable, a technical solution for logging functionality.

The technical documentation is a living document — it must be updated throughout the system’s operational lifecycle to reflect material changes, monitoring findings, and regulatory updates. It must be kept for a minimum of ten years after the system is placed on the market and made available to market surveillance authorities on request.

Why it matters operationally

Technical documentation matters because it is the interface between an organization’s AI governance practice and its regulatory accountability. A system that is well-governed but poorly documented is indistinguishable, from a regulatory standpoint, from a system that is poorly governed. Conversely, adequate technical documentation demonstrates that governance controls exist, were implemented before deployment, and are being maintained — which is precisely what regulators, notified bodies, and courts need to assess compliance and liability.

The most common technical documentation failure is not the absence of documentation, but documentation that is incomplete, outdated, or disconnected from the actual system in production. Organizations that develop AI systems rapidly often generate documentation as a compliance exercise after the system is built, rather than as a governance artifact alongside its development. The result is documentation that describes what the organization intended to build, not what was actually deployed.

Regulatory framework

Framework	Technical documentation requirements
EU AI Act — Annex IV	Defines the mandatory minimum content for technical documentation for high-risk systems. Must be maintained for 10 years after commercialization and made available to market surveillance authorities.
ISO/IEC 42001	The management system requires documentation of AI systems within scope, including policies, processes, control evidence, and continual improvement records.
ISO/IEC 23894	AI risk management requires documentation of identified risks, assessments, and treatment decisions — components of the technical file.
Notified Body requirements	Notified bodies evaluate technical documentation as the basis for their conformity assessment. Documentation adequacy is an explicit conformity criterion.

How Zertia evaluates it

Zertia evaluates technical documentation as a primary component of the High-Risk AI Systems Audit. The audit assesses whether the documentation covers all required Annex IV elements, whether it accurately reflects the system as actually deployed (not just as designed), whether it is being maintained and updated, and whether it would withstand review by a notified body or market surveillance authority. ISO/IEC 42001 certification evaluates documentation at the management system level — policies, processes, and governance records.

[High-Risk AI Systems Audit] · ISO 42001 Certification