Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Top: a graphical representation of the evidence-based usability knowledge framework. The numbering refers to the four steps, as described in the text. The question marks refer to the steps tackled in the present study. Bottom: an instance of the cause-consequence chain linking a usability flaw, a usage problem and a negative outcome (adapted from [27])
