I may be getting this a little or a lot wrong, but where better to share my muddled-thinking than here?
Subject = you or the person you may be obeserving in the virtual world.
Object = I take to be the objective, that which is the object of the activiity (the game)
Rules = that govern the world and the functionality of the game (breaking the rules and finding our using cheats is a game plan with these often built in as an additional layer to the game/ world)
Instruments = I take to be both external (the game console, hesdset and screen for example) as well as instruements internal to the games, as in weapons, magic wands, pots of treasure and so on).
The Community are all players, there being hundreds of thousands online, though a set group in your version of the world, some with whom you may interect, others you may not). It may include others around you in the room whi are znky playing the game, i.e. A father questioning his son and an American teaching eachother swear words
Division of labour-who does what. There is generally a naatural leader, I've observed my son in groups of up to five, but typically two or three, working as a pack, more than a team or platoon in a very structured way.
This is my take on it having had to read Engestrom's book
From Teams to Knots in which a variety of case studies, including a hospitlal and its relationship with GP surgeries is developed.
I cite and use activity systems all the time, whether to cnsider the relationship between two people developing ideas towgether (like us here Joanne) or between departments, as I did during a daylong away day with the OU Faculty if Business and Law, which I did today.
For me it lets me think beyound a person, or the physical presnce or make up of a group, to understand and to take into consideration influences upon snd eminating from them.
I know Conole has her pyramid thing, and I prefer 'spheres of influence' as a visualised concept, as this models are simply an expression of the complexity of what may be going on and can never take in the true variety of impacts and influences upon and from an individual or group.
My take on it! I may have not got it at all. The person I'd like to quiz is Engestrom himself (he has been known to visit The OU I am told).