The aim of this paper is to analyse the sociocultural dynamics underlying collaborative research. The article is based on an international collaborative project on the everyday lives of working families in Italy, Sweden and the USA. The aim of this paper is to show that collaborative research does not necessarily produce collaboration: this is possible only with very strong rules between partners. It proposes a distinction between collaboration and cooperation, and uses this distinction to examine intergroup and intragroup joint activity. Through the analysis of the communicative exchanges occurring between researchers, the paper highlights conditions in which cooperation can become fruitful collaboration.