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The air traffic controller must take important decisions in each moment. They manipulate a lot of data and parameters. With the increase of traffic it is more difficult to take decision rapidly and safely. In this paper we try to provide some tools able to help the controller in their work. To do that it is necessary to access to their decision-making process. We propose an approach. This approach is composed of a multiple criteria methodology, and interviews to obtain data. We present next an analysis of these interviews. This analysis show what we can extract from this technique: criteria, preferences for the multiple criteria methodology, and how we use it for propose some tools. The following step will be to integrate the results of these analyses to our system.