What is componets of flexiable budget?

What is componets of flexiable budget?
A flexible budget, or "flex" budget, incorporatesdifferent expense levels into the budget, depending upon changes inthe amount of actual revenue generated. This approach varies fromthe more common static budget, which contains nothing butfixed expense amounts that do not vary with actual revenuelevels.In its simplest form, the flex budget uses percentages ofrevenue for certain expenses, rather than the usual fixed numbers.This allows for an infinite series of changes in budgeted expensesthat are directly tied to actual revenue incurred. However, thisapproach ignores changes to other costs that do not change inaccordance with small revenue variations. Consequently, a moresophisticated format will also incorporate changes to manyadditional expenses when certain larger revenue changes occur,thereby accounting for step costs. By incorporating thesechanges into the budget, a company will have a tool for comparingactual to budgeted performance at many levels of activity.