I don't think anyone has done ACCG356 as this will be the first time it is offered.
It sounds like a theory heavy subject (yuck!). But I don't know...just going by what is in their little blurb.
ACCG355, an extension of ACCG250, so I guess you'd know what kinda stuff to expect.
Remember that ACCG356 is 4cp. (Just as a side note, ACCG400 looks a tad more interesting. It is 2cp though.)