Brian Dorn Allison Elliott Tew Mark Guzdial Introductory Computing Construct Use in an End-User Programming Community. 27-32 2007 conf/vl/2007 VL/HCC http://doi.ieeecomputersociety.org/10.1109/VLHCC.2007.33 db/conf/vl/vlhcc2007.html#DornTG07