The present study provides a summary of five investigations undertaken to develop a French short visual analog measure of cohesion. Based on the conceptual model of cohesion and the Questionnaire sur l’Ambiance du Groupe (QAG), this instrument, QAG-a, is designed to capture the dynamic nature of cohesion when it is assessed with repeated and frequent measures during a period of time. The QAG-a consists of eight items assessing the four dimensions of the conceptual model. The rating is performed using a numeric visual analog scale on a 10-cm line. The psychometric analyses undertaken provided support for the content, construct, and predictive validity and the reliability of the QAG-a (Studies 1 to 4). They also indicated that this instrument is well suited for measuring cohesion with a repeated, frequent design across a period of time (Study 5)