Figure 3

A screenshot of the conjunctive navigation interface. The category-topic context drives the on-the-fly allocation of a set of topics related to a select set of categories (leftmost column), with a total of 71 possible variations corresponding to the 71 concept nodes. Selection of multiple categories, such as “Anatomy and Body System,” “Population and Subgroups,” and “Symptom or Sign” (leftmost column) immediately guides the consumer to relevant topics (middle column) lying at the intersection of all the categories (conjunctively), rather than those belonging to the union of all the categories (disjunctively). The topic-question context drives the dynamic generation of a set of questions (rightmost column) relating to a selected set of topics.