The cost of different labor categories is inherent in these numbers. For example, the management,
requirements, and design elements tend to use more personnel who are senior and more highly paid
than the other elements use. If requirements and design together consume 25% of the budget
(employing people with an average salary of $100/hour), this sum may represent half as many staff hours at the assessment element, which also accounts for 25% of the budget but employs persons with
an average salary of $50/hour.