Working with non-actors is increasingly common in contemporary film d’auter that works within the limits of documentary and fiction. With this work it is proposed a holistic approach to explore the creative and humanistic benefits of working with non-actors in fiction. First, this work proposes a framework for reflection on film acting and how it intervenes in the construction of the film. Secondly, it will be shown the process that has taken place during the direction of non-actors of the short film Mater Inerta directed by the own author.