This Feature Issue of EJOR is composed of selected papers presented on the AMAP  , IFIP WG 7.6 - IIASA Workshop on Advances in Modeling: Paradigms, Methods and Applications and on the CSM'98  , 12th JISR-IIASA Workshop on Methodologies and Tools for Complex System Modeling and Integrated Policy Assessment, both organized at IIASA in September 1998.

Editorial:

Modeling methodologies:

1. Y. Nakamori, Y, Sawaragi:   Complex systems analysis and environmental modeling,
2. H.J. Zimmermann:   An application-oriented view of modeling uncertainty,
3. D. Dolk:   Integrated model management in the data warehouse era,
4. M. Makowski, Modeling paradigms applied to the analysis of European air quality,
5. T. Bui:   Building agent-based corporate information systems: an application to telemedicine,
6. L. Krus, P. Bronisz:   Cooperative game solution concepts to a cost allocation problem.

Transportation and production logistics:

1. T. Crainic:   Service network design in freight transportation,
2. T. Gruenert, H.J. Sebastian:   Planning models for long-haul operations of postal and express shipment companies,
3. S. Irnich:   A multi-depot pickup and delivery problem with a single hub and heterogeneous vehicles,
4. C. Charalambous, T. Tahmassebi, K. Hindi:   Modeling multi-stage manufacturing systems for efficient scheduling,
5. E. Aats, M. Reijnhoundt, H. Stehouwer, J. Wessels:   A novel decomposition approach for on-line lot-sizing,
6. J. van der Vorst, A. Beulens, P. van Beek:   Modelling and simulation of multi-echelon food systems,
7. I. Houba, R. Hartog, J. Top, A. Beulens, L. van Berkel:   Using recipe classes for supporting detailed planning in food industry: a case study,
8. W. Ogryczak:   Inequality measures and equitable approaches to location problems.

Environmental applications:

1. M. Kainuma, Y. Matsuoka, T. Morita:   Estimation of embodied CO2 emissions by general equilibrium model,
2. T. Masui, T. Morita, J. Kyogoku:   Analysis on recycling activities using multi-sectoral economic model with material flow,
3. M. Kainuma, Y. Matsuoka, T. Morita:   AIM/End-use model and its application to forecasting Japanese carbon dioxide emissions,
4. K. Olendrzynski, E. Berg, J. Bartnicki:   EMEP eulerian acid deposition model and its application,
5. M. Ryoke, Y. Nakamori, C. Heyes, M. Makowski, W. Schoepp:   A simplified ozone model based on fuzzy rules generation.

Modeling risk:

1. Y. Ermoliev, T. Ermolieva, G. MacDonald, V. Norkin, A. Amendola:   A system approach to management of catastrophic risk,
2. H. Tamura, K. Yamamoto, S. Tomiyama, I. Hatono:   Modeling and analysis of decision making problems for mitigating natural disaster risks.

Tools and applications:

1. J. Granat, M. Makowski:   Interactive specification and analysis of aspiration-based preferences,
2. H. Hayashi:   Multicriteria analysis for agricultural resource management: A critical survey and future perspectives,
3. N. Baba, H. Suto:   Utilization of artificial neural networks and TD-learning method for constructing intelligent decision support systems,
4. Y. Hamam, K. Hindi:   Assignment of program modules to processors in distributed systems by simulated annealing.

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