Introduction. Holland's theory, along with Gottfredson and Holland's professional analysis work, have produced the PCI (Position Classification Inventory), a simple method for classifying any occupation in accordance with Holland's Typology theory. The purpose of our study is to perform an analysis of a Spanish translation of the Position Classification Inventory (PCI) in order to check its psychometric properties in a Spanish sample. Method. We prepared a translation of the PCI which was applied to a sample of 525 subjects pertaining to 78 different occupations. We calculated the reliability of each of the six scales that the instrument measures, relating to the six types of environmental models proposed by Holland (Realistic, Investigative, Artistic, Social, Enterprising and Conventional) and we performed an item analysis in order to verify to what extent each item is representative of its scale. Results. Reliability indices range from 0.65 to 0.85. The Investigative, Social Enterprising and Conventional scales obtain reliability indices below 0.80. The item analysis allowed us to detect 42.3% of items that do not meet established criteria, and therefore are not considered discriminative for the scales they belong to. Discussion. We feel it necessary to adapt the PCI, substituting the items with less discriminating power for their scales, in order to get a more precise instrument where the scales have greater reliability indices. At the same time, we suggest that new studies be carried out using different samples in order to verify the instrument’s reliability. ; Introducción. La teoría de Holland y los trabajos en el análisis profesional Gottfredson y Holland han proporcionado el PCI (Position Classification Inventory) que representa un método sencillo para clasificar cualquier ocupación de acuerdo con la teoría Tipológica de Holland. La finalidad de nuestro estudio es realizar un análisis de una traducción al español del Position Classification Inventory (PCI) con la pretensión de verificar sus propiedades ...