We do these in different ways. PPM's are assessment tasks in my school, where teachers work with an ability group (targeted term in advance) in maths and the subject leader observes to ascertain progress then meets teacher to discuss next steps. PCM's (pupil conference meeting) are where the subject leader and team leader talks to the teacher once a term about groups of learners on the tracker & next steps. Is this helpful? Acronym madness but everyone used to it now.