Does the subject want to ask, "What does it mean to be a waiter in a Korean food stall for a trial day?" Probation period The waiter needs a three-day probation period, which is mainly a test for the applicant by the boss. In the field of job hunting, it is a common practice to see whether you are qualified for this job. In other workplaces, it means that everyone can't be competent for a job completely by mouth, saying that they need real work to know whether they are competent or not, so they need a probation period to see if they can formally go to work.