Abstract
It is striking to note to what extent the time issue in education is commonly understood in terms of chronology. It is an institutional and linear time that is divided and then fitted back together like a Russian doll in an analytical approach. The conception of time is reversible and possesses the same characteristics as space. It is a paradox that this institutional rationalization of time by reversible chronological divisions barely conceals the whole concrete and living reality of human time, which is a continuous process of change that philosophers generally call duration. On the contrary, far from the above reduction, its specificity lies in its irreversibility. This article intends to present both the results of empirical research on cooperative pedagogy and its current theorization. The emergence of complexity in time is visible in the primacy given to processes in the educational relationship. The way the multiple scales of complexity are superposed is reflected in the cooperative organization of work, for a new educational temporality which results in an increase in joyful emergences.