Big4 Common ISA Spine

The ISA-derived common audit spine that underlies the well-known firm methodologies. Each standards-based blueprint maps onto this spine, giving you a single normalized, public-standard model of a financial-statement audit engagement.
Phases
4
Procedures
17
Catalog version
0.14
Standards basis
ISA, PCAOB AS, IFRS, IIA GIAS (public standards)

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. Methodology-variant overlays inherit from this spine and add variant-specific tooling, naming, and signoff chains. Used as the harmonization root for the four methodology variants.