Editorial. 1. Models in research and education, planning and practice; F.W. Penning de Vries, R. Rabbinge. 2. Crop physiology of potato (Solanum tuberosum): Responses to photoperiod and temperature relevant to crop modelling; P.C. Struik, E.E. Ewing. 3. Modeling development and growth of the potato crop influenced by temperature and daylength: Lintul-potato; P.L. Kooman, A.J. Haverkort. 4. Physiology of crop response to drought; R.A. Jefferies. 5. Modelling water and nitrogen uptake of a potato crop growing on a ridge; P. de Willigen, M. Heinen, B.J. van den Broek. 6. Physiological effects of changes in atmospheric carbon dioxide concentration and temperature on growth and water relations of crop plants; S.C. van de Geijn, P. Dijkstra. 7. Simulated effects of elevated carbon dioxide concentration and temperature on the productivity of potato. Interaction with cultivar differences for earliness; A.H.C.M. Schapendonk, C.S. Pot, J. Goudriaan. 8. Nitrogen and the growth of potato crops; J. Vos. 9. Modelling to optimize the use of both water and nitrogen by the potato crop; D.K.L. Mackerron, G.J. Lewis. 10. Simulation of nitrogen uptake from soil and partitioning in potato plants: Model description and sensitivity analysis; S. Fishman, B. Bar-Yosef. 11. Crop physiology responses to infection by potato cyst nematode (Globodera spp.); A.J. Haverkort, D.L. Trudgill. 12. Modelling the interaction between potato crops and cyst nematodes; M. Oijen, F.J. de Ruijter, R.J.F. van Haren. 13. A growth model for plants attacked by nematodes; C.H. Schomaker, T.H. Been, J.W. Seinhorst. 14. Factors involved in the development of potato late blight disease (Phytophthora infestans); J.G. Harrison. 15. Simulation models of potato late blight; M. van Oijen. 16. Life cycle and ecology of Verticillium dahliae in potato; L. Mol, A.J. Termorshuizen. 17. Modelling the dynamics of Verticillium dahliae; A.J. Termorshuizen, L. Mol. 18. Use of a crop-growth model coupled to an epidemic model to forecast yield and virus infection in seed potatoes; T. Nemecek, J.O. Derron, A. Fischlin, O. Roth. 19. Prescriptive crop and pest management software for farming systems involving potatoes; W.R. Stevenson, J.A. Wyman, K.A. Kelling, L.K. Binning. 20. An advisory system for the management of potato cyst nematodes (Globodera spp.); T.H. Been, C.H. Schomaker, J.W. Seinhorst. 21. Handling qualitative and uncertain information; B. Marshall, J.W. Crawford, J. McNicol. 22. The use of models in potato breeding; D. Ellisseche, J. Hoogendoorn. 23. Agro-ecological zonation for potato production; H. van Keulen, W. Stol. 24. Future focus of physiology and modelling of potatoes; C.D. van Loon.