I'm leaving it for today at the point where I've almost completed the description of the structure of activity using my own Initial Study as an example.
It's still very sketchy, but it's a beginning. I still hesitate a lot and feel very insecure about determining what category each of my elements belongs to. For instance, seeing the learner as the subject is problematic - why not have the learner, teacher and peers as the subject, which would reflect a more collaborative endeavour?
I'll pick it up from Engeström 1999: 32 on Monday.