Also how would you include coherence and cohesion into an AC? Would you link it to the subsystems and how it influences the texts register, social purpose, contexts, etc?
As a rule of thumb, I'd be trying to link every linguistic feature you speak about to register/social purpose/function etc. Identifying linguistic traits is one thing - and a great start - but the really good ACs are the ones that contextualise those features with respect to the particular text you're discussing.
Coherence/cohesion are good things to talk about if you have a written text at hand. I'm not sure you need to link them to the subsystems explicitly (although they'd come under discourse if you were structuring your AC subsystem by subsystem), but it's good to talk about the factors listed in the study design that contribute to both coherence and cohesion.
Not sure if that was explained well at all - felt cumbersome. Let us know if you want anything clarified.
