The present article offers a conceptual, and at the same time operative, vision of the concept of multidimensional scaling. In the manner it is presented, the aim is, firstly, to help interested psychologists understand what the multidimensional scaling model is, using a number of simple, intuitive examples; and, secondly, for them to acquire the competence required to resolved different problems in multidimensional scaling through the use of specific software. The aim is also to download the presentation of mathematical formulae and method, without renouncing the methodological rigour that the subject demands.