Evaluating in a Healthcare Setting:A Comparison between Concurrent and Retrospective Verbalisation

The think-aloud protocol, also known as concurrent verbalisation protocol, is widely used in the field of HCI today, but as the technology and applications have evolved the protocol has had to cope with this. Therefore new variations of the protocol have seen the light of day. One example is retrospective verbalisation. To compare concurrent and retrospective verbalisation an experiment was conducted. A home healthcare application was evaluated with 15 participants using both protocols. The results of the experiment show that the two protocols have each their strengths and weaknesses, and as such are very equally good although very different.