The objective of this study is to analyze Portugal clusters recognized by the Operational Programme Competitiveness Factors within the scope of the National Strategic Reference Framework 2007-2013. It is intended through the study of indicators of geographical concentration measures, as well as the application of a questionnaire to examine whether the eight recognized clusters foreshadow and work with the necessary characteristics for the cluster classification. It is concluded that two clusters are assumed as cluster and two clusters have interaction links/more meaningful cooperation. Moreover, results show that only one cluster is functioning at its fullest while cluster.