I went into Starbucks this morning. It was packed, yet all the drink orders came out correct; a really low error rate. On each cup is a simple checklist job aid, completed when the order is made that tells the barista how to make the drink. Performance support. had always been confounded when completing my tax retun. But now, Turbo Tax hides the complexity and, after asking me a variety of simple questions, a miracle (at least to me) happens: my tax return comes out of my printer without me having to know anything about the pretzel logic of the tax code. Performance support again