Construction of Productivity Models - A Tool-Supported Approach in the Area of Facility Management. - Jörg Becker 001; Torben Bernhold; Daniel Beverungen; Nina Kaling; Ralf Knackstedt; Vanessa Lellek; Hans Peter Rauer (Enterp. Model. Inf. Syst. Archit. Int. J. Concept. Model., 2012)