# Scenario

A first-class axis on every posting naming which version of the future or past a record belongs to. The engine knows four kinds — actual, planned, simulated and custom — and Plan, Budget and Forecast are presets of planned, never kinds of their own. A scenario is stored either as a full independent set of postings or as adjustment-only deltas over a base.

- Source: [Ledgerbook glossary](/glossary/)
- Related: [Accounting data layer](/glossary/accounting-data-layer/), [Ledger of record](/glossary/ledger-of-record/), [Bitemporal ledger](/glossary/bitemporal-ledger/)