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Big4 Common ISA Spine

ISA-derived common audit spine shared by all Big4 firms. Each firm's methodology overlay maps onto this spine, giving you a single normalized model of how the four largest audit firms execute an engagement.
Phases
4
Procedures
17
Catalog version
0.14
License
Apache-2.0

Phases

  1. Pre-engagementphase_pre_engagement

  2. Planningphase_planning

  3. Executionphase_execution

  4. Closurephase_closure

Jurisdiction-neutral, tool-neutral procedure tree derived from the ISAs. Big4 firm overlays inherit from this spine and add firm-specific tools, naming, and signoff chains. Used as the harmonization root for EY GAM, PwC Aura, KPMG Clara, and Deloitte Omnia.