The objective of this dissertation is to contribute to the advancement of scientific knowledge about the impacts of product certification by accredited organisms in selected industrial sectors, through a multiple case study in Brazil. In the institutional context in which this research is situated, it is assumed that accreditation plays a crucial role in achieving confidence and trust between suppliers and consumers, as well as regulatory authorities. The research methodology encompasses: (i) bibliographical and documental review on accreditation, conformity assessment and product certification; (ii) design of a conceptual model that integrates the referred themes, within the perspective of future application in companies from selected industrial sectors in Brazil; (iii) design, conduction, and scoring of semi-structured interviews with managers of selected accredited organisms and companies; (iv) development of a multiple case study focusing on these selected companies; and (v) formulation of suggestions for future research and application in other sectors in Brazil. The main results can be summarized as follows: a conceptual model for evaluating the impacts of product certification by accredited organisms; and a consistent set of key drivers and operational indicators for measuring the impacts of product certification by accredited organisms.