Thomas R. G. Green Margaret M. Burnett Andrew Jensen Ko Karen J. Rothermel Curtis R. Cook Justin Schonfeld Using the Cognitive Walkthrough to Improve the Design of a Visual Programming Experiment. 172-179 2000 VL http://www.computer.org/proceedings/vl/0840/08400172abs.htm db/conf/vl/vl2000.html#GreenBKRCS00