Formative OSATS (SLEs) give trainees the opportunity to practise and get feedback for a given procedure.
Summative OSATS (AoPs) allow trainees to demonstrate their competence in that procedure and progress in their training.
Once a trainee feels they are competent in a procedure they can request an AoP.
The flow chart below illustrates this process:
REMEMBER! It is not possible for a trainee to request a formative (SLEs) OSATS encounter, and then upgrade this to a summative (AoP) encounter if it goes well.