Fig. 2.

Summative testing design. Participants (1) completed a quiz assessing their knowledge of appropriate special processing requests for blood products, (2) completed blood ordering tasks for 4 scenarios with either the original design or UCD orders and order set, (3) retook the same quiz with questions and answers shuffled, (4) completed one additional blood ordering scenario with the opposite design, and (5) answered survey questions on their preference between the designs and the perceived usability, ease of use, efficiency, and overall rating of the UCD. UCD, user-centered design.