Abstract
People process information on three levels: readability, understandability, and comprehension (Warren, 1993). Readability, how people perceive individual words, has been the focus of the majority of the research, but does not guarantee people understand the content. But the other two carry the information’s meaning. Comprehension, the highest level, is extracting the intending meaning from the text and being able to relate it to the world and use it in the situation. Fitting information to the situation requires comprehension, not just being able to read the content. HII works to focus design teams at the comprehension level for maximally effective communication.