Abrahamsson P, Salo O, Ronkainen J and Warsta J (2002) Agile Software Development Methods: Review and Analysis Vol. 478 VTT Publications p. 478. Google Scholar Aurum A and Wohlin C (2003) The fundamental nature of requirements engineering activities as a decision-making process. Information and Software Technology 45, 945–954. Article Google Scholar Balci O (1995) Principles and Techniques of simu