Web data extraction remains a challenging field. It is also challenging to determine competences and to model, identify and measure them. This book addresses some of the issues in these fields and presents an approach to extract professional/technical competences. The model for obtaining professional competences is proposed in this book which is based on an ontology with the competence concepts. The prototypical system is also described in this book which was developed in order to evaluate the proposed method for extracting, identifying and measuring competences.