Qualitative risk assessment for adventitious presence of unauthorized genetically modified organisms

The adventitious presence of unauthorized genetically modified organisms is becoming a concern for producers, manufacturers, consumers and other participants in the supply chain of food and feed products. A special part of a decision support system was dedicated to this problem in the Co-Extra project (Co-Extra: GM and non-GM supply chains: their CO-EXistence and TRAceability EU FP6 Integrated project 007158). In this paper, the context of the problem is described and a prototype solution in the form of two decision support models is suggested. The models are presented in detail with a special focus on their comparison from a user's perspective and from the perspective of expressive power. The paper concludes with comments and suggestions for similar decision support tool implementations.