Momentum accounting and triple-entry bookkeeping is an alternative accountancy system developed by Yuji Ijiri and is the title of the 1989 monograph that he wrote.[1] It is hard to imagine alternatives to the universal system of double-entry bookkeeping, but this is one.
In regular, double-entry bookkeeping, changes in balances such as earning revenues and collecting cash are recorded. These events are recorded with two entries, usually a debit and a credit, assigned on a given date. In momentum accounting, changes in balances are the recognized events. For example, an acceleration in revenue earning, such as a $1,000 per period increase of revenues from $10,000 per month to $11,000 per month, is a recordable event that would require three entries to implement.