Audit Methodology Library
Open reference covering Big4 audit methodology, jurisdictional regulatory overlays, KYC blueprints, banking forms, and audit scenarios. Built on the typed datasynth-audit-fsm crate. Apache-2.0.
Big4 Methodology
ISA-derived common spine + 4 firm overlays (EY GAM, PwC Aura, KPMG Clara, Deloitte Omnia) + cross-firm equivalence map.
4 phases · 17 procedures
Jurisdictional Overlays
7 regulatory overlays: PCAOB US, EU CSRD, UK FRC, ASIC AU, JFSA JP, ACRA SG, HKICPA HK.
39 procedures
Methodology Blueprints
Named methodology blueprints with full ISA / ESRS reference tagging.
ISA 600 · CSRD limited assurance
KYC Blueprints
6 KYC / AML workflows: private-banking onboarding, correspondent banking, crypto-CASP, periodic review, SAR escalation, sanctions remediation.
6 workflows
Banking Forms
7 banking form ontologies (MROS SAR, UBS reconstructions, Wolfsberg CBDDQ + FCCQ) with full field mappings.
228 fields
Scenario Library
15 deterministic engagement scenarios with expected outcomes — clean engagement, qualified opinion, going concern, scope limitation, and more.
15 scenarios
RMM Taxonomy
12-factor Bayesian risk-of-material-misstatement scoring with Beta priors and ISA citation refs.
12 factors
L4 Graph Schema
Typed multi-directed property graph modelling the full engagement: entity → component → account → assertion → control → procedure → evidence → working paper → finding.
11 nodes · 10 edges
New · DataSynth 5.6.0
ISO 21378 Audit Data Collection — built into every dataset
Every GLAccount and every row of journal_entries.csv generated by VynFi now carries the ISO 21378:2022 audit-data classification — a stable global taxonomy with 5 Level-1 categories (Asset / Liability / Equity / Revenue / Expense), 28 Level-2 classes, and 45 Level-3 sub-classes.
This is the standard that audit-tool vendors quietly adopted to route GL data into their procedure pipelines without fighting through 200 firm-specific COA conventions. Caseware Cloud, IDEA, ACL, MindBridge, and the Big-4-internal data-analytic platforms (EY Helix, KPMG Clara Analytics, PwC Halo, Deloitte Argus) all support ingestion by ISO 21378 Level-2 class. SAF-T (Portugal), FEC (France), GoBD (Germany), and IRS-820 (US) export formats derive cleanly from the ISO codes.
VynFi-generated datasets import without manual COA mapping. The L2 code is the load-bearing field for procedure routing; the L3 code refines for procedures that need finer granularity (receivables aging by domestic / foreign / intercompany; cash disclosure separating restricted from unrestricted, and so on).
Use these blueprints with VynFi synthetic data
VynFi generates synthetic audit datasets conforming to any of these blueprints. Free tier includes 100K rows/month.