By Schaltegger, Stefan, Bennett, Martin, Burritt, Roger L., Jasch, Christine M.
By Darbellay, Frederic, Moody, Zoe, Lubart, Todd
By Heizer
By Makridakis, Spyros G., Wheelwright, Steven C., McGee, Victor E.
By Shenhar, Aaron J., Dvir, Dov
By Lee, Sang M., Schniederjans, Marc J.
By Jon Curwin, Roger Slater
By Rosenhead, Jonathan
By Duncan, W. Jack
By Kelemen, Mihaela L
By Ritchie, James
By Macdonald, John, of Management, Institute
By Unknown
By Lewis, James P.
By Brue, Greg
By Ballou, Ronald H.
By Pande, Pete
By K. Koskinen
By X. Gimbert
By K. Vitasek
By S. Collinson, M. Jay
By C. Pollitt, S. Van Thiel, V. Homburg, Kenneth A. Loparo
By Paul van Loon
By Alan H. Jeeves, Jonathan Crush
By D. Lyon, etc.
By Margaret Bruce, John Bessant
By Roger Connors, Tom Smith
By George Wright (Strathclyde Graduate Business School, UK), Paul Goodwin (University of the West of England
By David L. Wank (Sophia University, Tokyo)