Yes and no, as it is a difficult process because employer needs to prove it is not their fault that employee is not performing. To begin with you need to collect data over time, so pip is kind of a choice you’d go through to start collecting detailed info, then it might be that a simple course could help solve this if it is a knowledge based issue, then maybe there is another job in the company the employee could switch to, etc. Without any doubt employers do not like the process, it is easier to eliminate positions instead because it is not technically firing.