Final answer:
Personnel costs are usually one of the highest expenses in project management, including wages, benefits, and training for employees.
Step-by-step explanation:
Personnel Costs in Projects
It is indeed true that personnel costs often comprise one of the highest sources of expense in project management. Personnel costs typically include wages, benefits, and training for employees. These costs can quickly add up, especially for labour-intensive projects or those requiring specialized skills. Therefore, careful planning and management of personnel resources are vital to maintain budget control.