K. Beck, Extreme programming explained: Embrace change, 2 nd edition, 2004.

H. W. Desurvire, J. M. Kondziela, and M. E. Atwood, What is gained and lost when using evaluation methods other than empirical testing, Proc. People and Computers VII, pp.89-102, 1993.
DOI : 10.1145/1125021.1125115

E. Frøkjaer and M. K. Larusdottir, Prediction of Usability : Comparing Method Combinations, Proc. of Idea Group publishing conf., Hershey, pp.248-257, 1999.

E. Þ. Hvannberg, E. L. Law, and M. K. Lárusdóttir, Heuristic evaluation: Comparing ways of finding and reporting usability problems, Interacting with Computers, vol.19, issue.2, pp.225-240, 2007.
DOI : 10.1016/j.intcom.2006.10.001

URL : http://kth.diva-portal.org/smash/get/diva2:527675/FULLTEXT01

R. Jeffries, J. R. Miller, C. Wharton, and K. Uyeda, User interface evaluation in the real world, Proceedings of the SIGCHI conference on Human factors in computing systems Reaching through technology, CHI '91, pp.119-124, 1991.
DOI : 10.1145/108844.108862

C. Karat, R. Campbell, and T. Fiegel, Comparison of empirical testing and walkthrough methods in user interface evaluation, Proceedings of the SIGCHI conference on Human factors in computing systems , CHI '92, pp.397-404, 1992.
DOI : 10.1145/142750.142873

M. K. Larusdottir, E. R. Bjarnadottir, and . Gulliksen, J: The Focus of Usability Testing in the Software Industry, Proceedings of the World Computer Congress, 2010.

M. K. Larusdottir, Listen to your Users ? The Effect of Usability Evaluation on the Software Development Process, 2009.

D. Salah, H. Petrie, and R. F. Paige, Towards a Framework for Integrating User Centered Design and Agile Software Development Processes, Proc. Irish CHI, 2009.
DOI : 10.1145/1985793.1986017

K. Schwaber, SCRUM Development Process, OOPSLA'95 Worshop on Business Object Design and Implementation, 1995.
DOI : 10.1007/978-1-4471-0947-1_11

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

M. Singh, U-SCRUM: An Agile Methodology for Promoting Usability. AGILE '08, Conference, pp.555-560, 2008.
DOI : 10.1109/agile.2008.33

T. Uldall-espersen, E. Frøkjaer, and K. Hornbaek, Tracing impact in a usability improvement process, Interacting with Computers, vol.20, issue.1, pp.48-63, 2008.
DOI : 10.1016/j.intcom.2007.08.001

D. Wixon, Evaluating usability methods, interactions, vol.10, issue.4, pp.28-34, 2003.
DOI : 10.1145/838830.838870