European Journal of Operational Research 70 (1993) 436-437 North-Holland Contents Volume 70 The use of mathematical programming with artificial intelligence and expert systems (Invited Review) R.D. McBride and D.E. O’Leary The regional urban solid waste management system: A modelling approach C. Caruso, A. Colorni and M. Paruccini Designing distribution systems with transport economies of scale B. Fleischmann Simulated annealing for resource-constrained scheduling D.E. Jeffcoat and R.L. Bulfin Vendor selection with price breaks S.S. Chaudhry, F.G. Forst and J.L. Zydiak An explicative model of ‘public’ interorganizational interactions A. Ostanello and A. Tsoukias The principal /agent paradigm: Its relevance to various functional fields A. van Ackere EOQ models for continuously deteriorating products using linear and exponential penalty costs O. Fujiwara and U.L.J.S.R. Perera Complexity of single machine, multi-criteria scheduling problems C.-L. Chen and R.L. Bulfin Optimizing theory of constraints when multiple constrained resources exist G. Plenert Risk-value models (Invited Review) R.K. Sarin and M. Weber Planning and scheduling packaging lines in food industry G.D.H. Claassen and P. van Beek Network planning for scheduling operations in air cargo handling: a tool in medium term goodsflow control M.A.A.P. Verwijmeren and C.B. Tilanus A system dynamics model for AIDS policy support in Tanzania K. Heidenberger and S. Flessa Set-up saving schemes for printed circuit boards assembly O.Z. Maimon, E.M. Dar-El and T.F. Carmon Optimal allocation of time in a hospital pharmacy using goal programming P. Ghandforoush A comparison of centralized and decentralized control rules in push-type production ordering systems H. Matsuura and H. Tsubone Approximate solution of a dynamic job shop model with several job classes P. Legato A branch and bound algorithm for symmetric 2-Peripatetic Salesman Problems J.B.J.M. De Kort A multi-objective constrained resource information system project selection method M.J. Schniederjans and R. Santhanam A model for the assignment of candidates to constituencies in a mixed election system F. Mason and E.M. Tomasin On some useful properties of the Perron eigenvalue of a positive reciprocal matrix in the context of the analytic hierarchy process B. Aupetit and C. Genest Special Issue on Machine Scheduling Problems 269 Editorial J.N.D. Gupta and C.N. Potts 0377-221/793 /$06.00 © 1993 — Elsevier Science Publishers B.V. All rights reserved European Journal of Operational Research 70 (1993) 436-437 North-Holland Contents Volume 70 The use of mathematical programming with artificial intelligence and expert systems (Invited Review) R.D. McBride and D.E. O’Leary The regional urban solid waste management system: A modelling approach C. Caruso, A. Colorni and M. Paruccini Designing distribution systems with transport economies of scale B. Fleischmann Simulated annealing for resource-constrained scheduling D.E. Jeffcoat and R.L. Bulfin Vendor selection with price breaks S.S. Chaudhry, F.G. Forst and J.L. Zydiak An explicative model of ‘public’ interorganizational interactions A. Ostanello and A. Tsoukias The principal /agent paradigm: Its relevance to various functional fields A. van Ackere EOQ models for continuously deteriorating products using linear and exponential penalty costs O. Fujiwara and U.L.J.S.R. Perera Complexity of single machine, multi-criteria scheduling problems C.-L. Chen and R.L. Bulfin Optimizing theory of constraints when multiple constrained resources exist G. Plenert Risk-value models (Invited Review) R.K. Sarin and M. Weber Planning and scheduling packaging lines in food industry G.D.H. Claassen and P. van Beek Network planning for scheduling operations in air cargo handling: a tool in medium term goodsflow control M.A.A.P. Verwijmeren and C.B. Tilanus A system dynamics model for AIDS policy support in Tanzania K. Heidenberger and S. Flessa Set-up saving schemes for printed circuit boards assembly O.Z. Maimon, E.M. Dar-El and T.F. Carmon Optimal allocation of time in a hospital pharmacy using goal programming P. Ghandforoush A comparison of centralized and decentralized control rules in push-type production ordering systems H. Matsuura and H. Tsubone Approximate solution of a dynamic job shop model with several job classes P. Legato A branch and bound algorithm for symmetric 2-Peripatetic Salesman Problems J.B.J.M. De Kort A multi-objective constrained resource information system project selection method M.J. Schniederjans and R. Santhanam A model for the assignment of candidates to constituencies in a mixed election system F. Mason and E.M. Tomasin On some useful properties of the Perron eigenvalue of a positive reciprocal matrix in the context of the analytic hierarchy process B. Aupetit and C. Genest Special Issue on Machine Scheduling Problems 269 Editorial J.N.D. Gupta and C.N. Potts 0377-221/793 /$06.00 © 1993 — Elsevier Science Publishers B.V. All rights reserved Contents Volume 70 On scheduling to minimize earliness—tardiness and batch delivery costs with a common due date J.W. Herrmann and C.-Y. Lee Minimizing flow time variance in a single machine system using genetic algorithms M.C. Gupta, Y.P. Gupta and A. Kumar A heuristic for the single machine tardiness problem S.S. Panwalkar, M.L. Smith and C.P. Koulamas A note on optimal assignment of slack due-dates in single-machine scheduling V.S. Gordon Algorithms for preemptive scheduling of different classes of processors to do jobs with fixed times V.R. Dondeti and H. Emmons A priority rule for minimizing weighted flow time in a class of parallel machine scheduling problems S.T. Webster Two parallel machine sequencing prob!ems involving controllable job processing times B. Alidaee and A. Ahmadian An approximation algorithm for the m-machine permutation flow shop scheduling problem with controllable processing times E. Nowicki The complexity of scheduling jobs in repetitive manufacturing systems H. Kamoun and C. Sriskandarajah Performance of scheduling algorithms for no-wait flowshops with parallel machines C. Sriskandarajah Worst-case analysis of heuristics for open shops with parallel machines B. Chen and V.A. Strusevich Two machine open shop scheduling problem to minimize an arbitrary machine usage regular penalty function N.V. Shakhlevich and V.A. Strusevich On scheduling influential stochastic tasks on a single machine K.D. Glazebrook and S. Greatrix Job selection and sequencing on a single machine in a random environment P. De, J.B. Ghosh and C.E. Wells Some remarks about the ‘equivalence’ of performance measures in scheduling problems Y. Gerchak and M.J. Magazine Contents Volume 70