This paper presents an approach to build multilayer cognitive maps, and gives an example of utilization. In the modeled of a problem using cognitive maps, it is possible the utilization of several cognitive maps, where each one expresses a different aspect (knowledge) of the problem, but which must be interlinked. That is, a multilayer cognitive map can enrich the modeling of a system, with the flow of information between layers that represent specific knowledge, to derive the behavior of the concepts in a layer from the concepts in other layers. In this work is proposed the conceptualization of a multilayer cognitive map, and is presented its application in order to analyze the emergent properties of Wikipedia.