The Swiss Alps are an exceptional territory, as much by its position at the crossroads of various spheres of influence as by the discoveries of major importance for the understanding of ancient periods. Our project concerns the study of neolithic societies across the Swiss Alps using an interdisciplinary approach by combining stable isotopes, radiocarbon, dental nonmetrics, aDNA analysis and palaeopathology to understand the evolution of diets, subsistence practices and mobility of these human groups. While the studies are still in progress, we present here some of the results on stable isotopes (δ13C, δ15N, δ34S, 87Sr/86Sr) combined with new radiocarbon analysis on the middle neolithic necropolis from Barmaz (Valais). The old radiocarbon data of the site showed a long occupation of five centuries. The new data allow us on the one hand to specify the occupation times of the different zones of the necropolis but also to highlight particular events corroborated by the isotopic data, whether indicative of diet or mobility. Thus, we present here a case study where the combination of all the isotopic parameters has made it possible to offer new hypotheses concerning the events and links that united certain individuals in the necropolis.