In the case of temporary employment , a personnel service provider such as Randstad leases staff to customer companies for a limited period of time. The employment contract is concluded between Randstad and the temporary worker, but he works in changing and temporary assignments in the customer company on site.  When a company has vacancies to fill, it can either use its own human resources department or hire a recruitment company like Randstad to handle the recruitment process. The underlying principle in this case is called recruitment . The applicant concludes the employment contract directly with the company. Randstad only acts as an intermediary.