  Knowledge workers, such as scientists, journalists, or consultants,
adaptively seek, gather, and consume information. These processes are often
inefficient as existing user interfaces provide limited possibilities to
combine information from various sources and different formats into a common
knowledge representation. In this paper, we present the concept of an
information collage (IC) -- a web browser extension combining manual spatial
organization of gathered information fragments and automatic text analysis for
interactive content exploration and expressive visual summaries. We used IC for
case studies with knowledge workers from different domains and longer-term
field studies over a period of one month. We identified three different ways
how users collect and structure information and provide design recommendations
how to support these observed usage strategies.
