@inproceedings{CHI-1991-BellRL,
	author        = "Brigham Bell and John Rieman and Clayton H. Lewis",
	booktitle     = "{Proceedings of the Ninth ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/108844.108846",
	isbn          = "0-89791-383-3",
	pages         = "7--12",
	publisher     = "{ACM}",
	title         = "{Usability testing of a graphical programming system: things we missed in a programming walkthrough}",
	year          = 1991,
}