[1] Chalmers Univ Technol, Dept Technol Management & Econ, Div Qual Sci, S-41296 Gothenburg, Sweden
[2] Karlstad Univ, Serv Res Ctr, CTF, Karlstad, Sweden
[3] Linkoping Univ, Linkoping, Sweden
[4] Volvo Construct Equipment, Customer Support, Eskilstuna, Sweden
[5] Malardalen Univ, Sch Innovat & Design, Eskilstuna, Sweden