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An EU-funded project (SIGMEA, WP2 subgroup maize) is collating European studies of pollen and seed mediated gene flow in maize for use in solving current problems of coexistence and for predicting research gaps. The project aims to collate and to validate information in greater detail than is usually available in refereed publications. Critical assessment will be made of the extent to which the SIGMEA data sets fill important gaps in knowledge, notably in (a) pollen-mediated gene flow over short, medium and long distance,(b) the influence of GM volunteers on out crossing rates and (c) agronomic methods to meet GM marketing thresholds. Factors on which information is still lacking or uncertain in coexistence are identified as flowering dynamics, vertical pollen take off, elevation profiles in maize, gene flow in silage maize and gene flow at a landscape level. Further research is also needed in quantifying the contributions of field size, number and spatial distribution of maize fields to check the feasibility of implementing isolation distances in a certain region.