Expert review of legislation. The legislation should identify and clearly define the different elements of salary and the criteria and procedures to allocate them. Elements of salary should be the base salary and salary supplements. Salary supplements that are not consolidated in the total salary and can change over time are referred to as variable salary (or variable pay). For instance, an employee’s performance can be rewarded in the form of an annual bonus which is not consolidated in the total salary, and thus may change each month. In other salary systems, positive performance can be rewarded with a salary step that becomes consolidated. The sum of the base salary and the salary supplements that are consolidated in the total salary may be referred to as fixed salary. Clear and transparent criteria and procedures to allocate all these elements of salary, and the corresponding amounts, in each case, should be established in the legislation.