This article analyses the characteristics that social intervention projects should have so as to be considered a good practice in intercultural terms. A Good Intercultural Practice Scale has been designed and used on 139 social intervention projects developed in Andalusia (Spain) by diverse public and private institutional actors in order to measure the impact of considering elements of cultural diversity in the design and implementation of social intervention projects. The results obtained show that considering the elements of cultural diversity in services aimed at culturally heterogeneous populations improves the intercultural performance of such services.