Hiroshi Taguchi Fumiko Harada Hiromitsu Shimakawa Promoting Acquisition of Programming Skills by Reuse of Active Diagrams. 101-106 2008 C5 http://doi.ieeecomputersociety.org/10.1109/C5.2008.7 conf/c5/2008 db/conf/c5/c5-2008.html#TaguchiHS08