European Journal of Operational Research 66 (1993) 403-404 North-Holland Contents Volume 66 Flexible manufacturing systems: An investigation for research and applications (Invited Review) A. Gunasekaran, T. Martikainen and P. Yli-Olli Determining market response functions by neural network modeling: A comparison to econometric techniques H. Hruschka Fuzzy nonlinear regression analysis of dose-response relationships A. Bardossy, I. Bogardi and L. Duckstein Diversification under yield randomness in inventory models M. Parlar and D. Wang A sequencing problem in the weaving industry M.H. Al-Haboubi and §.Z. Selim Characterization of desirable information processing and decision making systems in organization K. Kijima On repetitive control and the behaviour of a middle-aged consumer J.B. Krawczyk and G. Karacaoglu A multiperiod planning model for communications satellites A. Dutta and D.V. Rama Optimal bus services on express basis in the case of balking and reneging R.R. Sharma, R.C. Rai and A. Mishra Analyses of spares for new weapons systems using Markov chains C.R. White Batching policies for a repair shop with limited spares and finite capacity R.C.H. Chua, G.D. Scudder and A.V. Hill Bicriteria network flow problems: Integer case H. Lee and P.S. Pulat OR Software ORSEP - Operations Research Software Exchange Program, H.W. Hamacher (ed.) HOPDM - A higher order primal—dual method for large scale linear programming, A. Altman and J. Gondzio Special issue on Strategic Planning of Facilities 161 In search of a valid view of model validation for operations research M. Landry and M. Oral 168 Revisiting the issue of model validation in OR: An epistemological view R. Déry, M. Landry and C. Banville 184 Decision science or decision-aid science? B. Roy 204 A foundational concept of science appropriate for validation in operational research H.J. Miser 216 The facets of the modeling and validation process in operations research M. Oral and O. Kettani 235 Modeling muddles: Validation beyond the numbers J.H. Smith 250 Model accreditation: A rationale and process for determining a numerical rating S.I. Gass 259 Minimizing variation of production rates in just-in-time systems: A survey (/nvited Review) W. Kubiak 272 A planning model for determining the optimal location and size of traffic centers: The case of Dammam Metropolitan, Saudi Arabia T.N. Al-Faraj, A.S. Alidi and A.A. Al-Ibrahim Optimal bin location and sequencing in printed circuit board assembly L.R. Foulds and H.W. Hamacher Multicriteria facility layout problem: An integrated approach J.S. Shang A Lagrangian heuristic for the capacitated plant location problem with single source constraints R. Sridharan 0377-2217/93/$06.00 © 1993 — Elsevier Science Publishers B.V. All rights reserved Contents Volume 66 Incorporating vehicle routing into the vehicle fleet composition problem S. Salhi A parallel route building algorithm for the vehicle routing and schedulingproblem with time windows J.-Y. Potvin and J.-M. Rousseau Coordinated transportation systems: An alternative approach to traditional independent systems H.M. Baker, L.S. Franz and J.R. Sweigart On representatives of multi-index transportation problems W. Junginger Competitive location on a network A. Bauer, W. Domschke and E. Pesch Efficient chains in a network with time—cost trade-off function on each arc K.P.K. Nair, V.R. Prasad and Y.P. Aneja Contents Volume 66