Ideally you would have hired the employee in a temporary role knowing that it was not a permanent position. Therefore, when the study is coming to an end it should line up with the end date given to the employee and you can advise the employee with as much notice as possible (i.e., 2 weeks). Once the employee is finished working, you will need to complete the Termination Form on HHS intranet.
Full-time/Part-time Permanent employee:
If the employee is in a permanent position and the study is closing or there is no longer work available you should reach out to your Human Resources Business Partner to discuss the situation before moving forward.