@inproceedings{Onward-2013-XuCBD,
	author        = "Han Xu and Oliver Creighton and Naoufel Boulila and Ruth Demmel",
	booktitle     = "{Proceedings of the Third Symposium on New Ideas in Programming and Reflections on Software}",
	doi           = "10.1145/2509578.2514737",
	editor        = "Antony L. Hosking and Patrick Th. Eugster and Robert Hirschfeld",
	isbn          = "978-1-4503-2472-4",
	pages         = "91--100",
	publisher     = "{ACM}",
	title         = "{User model and system model: the yin and yang in user-centered software development}",
	year          = 2013,
}