@inproceedings{HCI-EI-1999-Johnson,
	author        = "Peter Johnson",
	booktitle     = "{Proceedings of the Eighth International Conference on Human-Computer Interaction. Volume 1: Ergonomics and User Interfaces}",
	isbn          = "0-8058-3391-9",
	pages         = "1199--1204",
	publisher     = "{Lawrence Erlbaum}",
	title         = "{Tasks and Situations: Considerations for Models and Design Principles in Human Computer Interaction}",
	year          = 1999,
}