i find it's a tough one; a few times i've made a list and occasionally it's worked, other times the list has been a distraction to what was happening in session and ended up being more of a hindrance. then again when i go in and it feels like nothings happened and i leave thinking there was so much i wanted to say and didn't; it's also difficult; so i'd go with suggesting a mixed strategy also. A list of a few things incase you want to refocus but give yourself room for the session to evolve also