Whilst APP isn’t perfect, it does provide a useful framework of outcomes for teaching assistants to use with the students they are supporting.
Teaching assistants working with individuals or small groups of students could use the APP criteria to ask appropriate questions with the intention of moving individuals on. Using the APP gives a structure to this process and allows the TA to select appropriate questions.
I wrote a short document for teaching assistants in my local authority. Feel free to download it and distribute it to your own teaching assistants.