A consulting firm in London had previously had static budgets.

Explanation

A rolling budget is continually updated to add a new budget period as the most recent budget period is completed. Thus, the rolling budget involves the incremental extension of the existing budget model. By doing so, a business always has a budget that extends one year into the future.

Think of continuous (rolling) budgets as waves rolling ashore on the beach. A new wave comes in each time, replacing the one that was there before. From a financial perspective, the wave is your budget, and the time between waves is longer! These reporting time frames can be monthly, quar-terly, yearly, etc.

An incremental budget is a budget prepared using a previous period's budget or actual performance as a basis with incremental amounts added for the new budget period.

Zero-based budgeting (ZBB) is a method of budgeting in which all expenses must be justified for each new period. The process of zero-based budgeting starts from a "zero base," and every function within an organization is analyzed for its needs and costs. Budgets are then built around what is needed for the upcoming period, regardless of whether each budget is higher or lower than the previous one.

Activity-based budgeting (ABB) is a system that records, researches, and analyzes activities that lead to costs for a company. Every activity in an organization that incurs a cost is scrutinized for potential ways to create efficiencies. Budgets are then developed based on these results.