Expert evaluations provide alternatives to user testing for evaluating designs and usability. This document discusses two expert evaluation methods: cognitive walkthroughs and heuristic evaluations. In cognitive walkthroughs, experts imagine how users would perform tasks to identify potential problems. Heuristic evaluations involve experts assessing how a design conforms to predefined usability guidelines or heuristics from sources like Nielsen and Norman. Both methods are relatively quick and cheap compared to user testing.