In a dynamic environment where organizations are continuously exposed to change, being robust, strong and competitive is a major managerial task. The aim of this article is to study the impacts of adopting multiple certifications on firm performance, by considering the dynamics involved in this process. A sample of 247 Portuguese firms that had adopted multiple certifications by 2015 encompassing the ISO 9001, ISO 14001 and OHSAS 18001 standards were studied by means of a longitudinal analysis. (...)