Jim Haungs Martin Fowler Ralph E. Johnson Steve McConnell Richard P. Gabriel Software development: arts & crafts or math & science? 141-142 2004 conf/oopsla/2004 OOPSLA Companion http://doi.acm.org/10.1145/1028664.1028720 db/conf/oopsla/oopsla2004.html#HaungsFJMG04