The aim of this dissertation is to contribute to the understanding of some basic infrastructural technologies (TIB acronym in Portuguese) supporting innovation of technology-based micro, small and medium size enterprises (MSMEs) in Brazil. Given the critical role played by these firms in Brazil s social and economic development, the work seeks to answer how they perceive the importance of TIB in their innovation cycle. The methodology comprises: (i) a literature survey to elaborate a theoretical outline to characterize the core subjects of the dissertation: technology-based MSMEs; TIB; and technological innovation; (ii) definition of the object of study, of the primary data source – Technological Innovation Survey (Pesquisa de Inovação Tecnológica-PINTEC), of IBGE (Brazilian Statistical Office), and the analytic framework; (iii) to request IBGE to produce special tabulations; receipt, formatting and analysis of data; and analysis of results; and (iv) formulation of conclusions and suggestions for the next PINTEC survey and for future research. The main results can be summarized as follows: (i) identification of four PINTEC items associated with some TIB functions; (ii) identification and analysis of Brazilian technology-based MSMEs perceptions of the relevance of TIB functions for supporting innovation; and (iii) comparative analysis of patterns of response of innovative and non-innovative technology-based MSMEs. As conclusion, it can be said that, in general, these firms positively respond to TIB functions in innovation cycle. In particular, results show that innovative enterprises perceived better some TIB functions than the non-innovative ones.