The objective of this article is to analyse the potential of ComunicARTE, an innovative Spanish Language teaching/learning program that uses project-based learning to develop dialogic spaces which promote the communicative competence of Spanish students, together with social, emotional and motivational outcomes. Two schools have been observed with this in mind: an experimental one using this program and a control one. This is a longitudinal study with pre-and post-test data which analyses 170 children at the beginning of their fifth year and the end of their sixth year in primary school. Quantitative tests have been used to assess their communicative competence and motivational orientation in the classroom. The results obtained are discussed.