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The Hierarchy

One Diagram That Explains Everything

OIR: What the Organization Needs to Know

AIR: Specifying Asset Information

PIR: What the Project Must Answer

EIR: The Requirements That Enter Contracts

Quick Check: The Hierarchy

The Deliverables

AIM and PIM: The Two Information Models

Why Clients Require Information: The Stated Purposes

Quick Check: The Models

The requirements hierarchy decoded: OIR, AIR, PIR and EIR, how they connect, and how they shape the two information models — the AIM and the PIM.

Four acronyms terrorize every ISO 19650 newcomer. This module turns them into one simple, logical chain — from the organization's strategic questions down to the contract clause, and out to the two information models: the AIM and the PIM.

The Requirements Hierarchy: OIR, AIR, PIR, EIR — and the Models They Produce

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