Abstract: Disclosed are various approaches for searching for electronic information. In one embodiment, a first plurality of objects is presenting for user selection. The first plurality of objects is a first subset of a second plurality of objects that is organized by a plurality of containment categories in a data structure. A plurality of associations is stored, and each association defines a relationship between one of, two different ones of the plurality of categories, or two objects in two different ones of the plurality of containment categories. In response to user selection of one of the first plurality of objects, a second subset of the second plurality of objects is selected. Selection of the objects in the second subset is in part a function of respective weighted relevance values for associations of the selected object to each of the second plurality of objects. The second subset of objects is output.