Whenever I enter a NA which relates to a person, I start it with the person's name:
Val: agree which bills we can pay this month
project X steering team: have X escalate problem Y to Z
I use the alphabetical filter in Pocket Informant to bring up the "V" in any category to see what I have to work with anyone I meet. (Whether @waiting, @Bracknell office, @home, @phone or whatever.)
I am struggling to decide whetehr I still need an @agenda category - it's just one more list to forget to check...