The business world is highly dynamic and business enterprises will time and again have competence needs that cannot always be met by hiring full time staff. Such needs include;
Development of systems and structures for small businesses that cannot afford to recruit a high caliber manager or consultant.
Work requiring skills that do not currently exist within the business but the work load does not justify an additional full-time employee.
Specialized tasks that may require a consultant but the business cannot afford the services of a practicing consultant.
Some roles require an independent eye for independent validation, verification, monitoring and evaluation, technical audit etc. and therefore a full time employee, auditor or consultant could compromise integrity of the process.
Temporally relievers for employees who are on leave.
In these circumstances, a business may consider hiring a part time staff to work on site or off site. More on Professional Service Pooling