The Spanish National Agency for Quality Assessment and Accreditation as part of its evaluation activities has established a procedure for evaluating both teaching and institutions, by means of the Institutional Assessment Programme. In this communication we shall focus on the external assessment phase for qualifications in the field of Industrial Engineering and specifically on the structures of the database for a Decision Support System on the universities' rankings. In particular, this paper will focus on obtaining the weight of the criteria and definition of the linguistic labels used in the external assessment phase. Keywords-- Analytical Hierarchy Process (AHP), Linguistic Labels, Qualification evaluation, Weighting Criteria