EN ISO 29481-1:2025 PDF

Overview

EN ISO 29481-1:2025 - Building information models - Information delivery manual (Part 1: Methodology and format) defines a standardized methodology and format for describing information exchange requirements across the life cycle of buildings and infrastructure. Known as the Information Delivery Manual (IDM), the document specifies how to record a use case, its business context and the precise exchange requirements in plain language to enable reliable, repeatable and high‑quality information exchanges and software interoperability.

Key topics and technical requirements

• IDM structure: An IDM is composed of three core components - Use Case description, Business Context (process and interaction maps) and the Exchange Requirements that define what information must be delivered, when and between which parties.
• Methodology: Step‑wise approach to identify trigger events, map business processes, specify interactions, then derive detailed information exchange requirements.
• Common metadata: Requirements for header/overview metadata for IDM components to support clarity, traceability and reuse.
• Exchange specification elements: Concepts such as information units, information constraints, and timing of exchanges (when during an asset life cycle information is required).
• Technical implementation guidance: Guidance on interaction frameworks, model view definitions and how IDMs can be represented or implemented by software - while no single data format is mandated, the IDM supports formats including but not limited to IFC/model view definitions.
• Tools & mappings: Informative annexes include IDM development process examples, simplified IDM components, life‑cycle stage references, and mapping methods using BPMN and interaction map symbols.

Practical applications

• Improves BIM interoperability by giving project teams and software vendors a plain‑language, structured specification of information exchanges.
• Ensures clarity of responsibilities for information delivery across design, construction and operations (asset lifecycle), reducing rework and disputes.
• Supports procurement, regulatory compliance and asset management by defining what information is required at specific triggers (e.g., handover, maintenance).
• Enables software developers to implement consistent export/import behaviors aligned to an IDM, improving automated data workflows.

Who should use this standard

• Project clients, owners and asset managers defining deliverables.
• Designers, contractors and facility managers coordinating information handovers.
• BIM managers and information managers aligning workflows to ISO 19650 principles.
• Software vendors and integrators implementing interoperability and model view definitions.

Related standards

• ISO 29481 (Parts 2 and 3) - Interaction framework and Data schema (complements Part 1).
• ISO 19650 - Information management principles for the asset lifecycle.
• IFC / Model View Definitions - common technical formats often used with IDM implementations.

EN ISO 29481-1:2025 is essential for teams seeking repeatable, auditable information exchange practices that enable digital collaboration and interoperability across the built environment.