  We explore how the availability of a sensemaking tool influences users'
knowledge externalization strategies. On a large display, users were asked to
solve an intelligence analysis task with or without a bidirectionally linked
concept-graph (BLC) to organize insights into concepts (nodes) and relations
(edges). In BLC, both nodes and edges maintain "deep links" to the exact source
phrases and sections in associated documents. In our control condition, we were
able to reproduce previously described spatial organization behaviors using
document windows on the large display. When using BLC, however, we found that
analysts apply spatial organization to BLC nodes instead, use significantly
less display space and have significantly fewer open windows.
