Simon Attfield Ann Blandford Improving the Cost Structure of Sensemaking Tasks: Analysing User Concepts to Inform Information System Design. 532-545 2009 INTERACT (1) http://dx.doi.org/10.1007/978-3-642-03655-2_60 conf/interact/2009-1 db/conf/interact/interact2009-1.html#AttfieldB09