Web portals are currently an important means to access Internet information. The use of Web portals permits a vast amount of data to be obtained rapidly. However, the quality of the data recovered by the user is fundamental. We therefore propose a thesis in which a model, denominated as SPDQM (SQuaRE Portal Data Quality Model) will be defined. The proposed model will be based on a previous model, PDQM (Portal Data Quality Model) and the SQuaRE (Software product Quality Requirements and Evaluation) standard. Finally, upon the model's completion, an automatic tool with which to asses the data quality (DQ) in Web portals will be developed.