Aarne H. Ylä-Rotiala. I received an M.Sc in CS from the University of Helsinki in 1990. I have worked as a programmer, both as an employee and as an independent contractor for five years. I have participated in several commercial projects, as a subcontractor or as a principal contractor. I have started my Ph.D studies, that were inspired by these practical experiences. Currently I am working for Nokia Telecommunications' Software Engineering Methodology Development.