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COACH watches your actions to build an adaptive user model (AUM) that selects appropriate advic?., Just as a football coach will stand on the sidelines and enconrage, cajole or reprimand, so COACH is an advisory system that does nor intrrfprr with the user’s actions but comments opporurnistitally to help the user along.

COACH might choose to use description, example, syntax, timing, topic, style and level of help according to user-demonstrated experience and proficitwcy. A description that advertises a command or function is helpful for getting started, but might become Ignored if it is prewntrd too often.