Receiving a bad evaluation does not always immediately result in termination or probation. In my experience as an HR Manager, a poor performance evaluation will lead to coaching or a performance improvement plan. If performance does not improve as a result of those interventions, the employee could be dismissed. In some cases, the performance plan contains elements like "additions instances of <insert performance issue or behavior problem> could result in further discipline, up to and including dismissal. As for "probation", that is not a term I hear often outside of the period when an employee is new to the company for example the first 90 days or the first 6 months. In the case of the poor performance evaluation, they may go on some kind of performance warning, much like the plan I described above. I hope this was helpful for you! Best of luck!