Founded in 2002 and led by Dr Juana Gómez, the Research Group on Measurement Invariance and Analysis of Change (GEIMAC) is an interdepartmental research group based in the Faculty of Psychology of the University of Barcelona. Its work centres on detection, evaluation, analysis and intervention in relation to significant problems in the field of human behaviour, whether on the individual, interpersonal or group level. The group’s research is particularly concerned with problems that affect people’s health and quality of life, and in this context special emphasis is placed on the design and methodological validation of new measurement instruments. These objectives require a multidisciplinary approach that brings together the methodological, clinical and social perspectives, thereby ensuring both scientific rigor and the possibility of addressing some of the key problems faced by contemporary society, as well as their health and social repercussions.