 As expected, Cartesian skepticism is one of the main objects of study. In almost every country we find scholars trying to understand its sources, the nature of its arguments, their force and persuasiveness. One decisive contribution, already noted above, is that of Porchat, who credited Descartes’s methodological use of skepticism a special place in the philosophy. In Porchat’s view of the 1980s (Porchat 1985, 1986), there was a strong affinity between ancient skepticism and Cartesian doubt, so that one could speak properly of a skeptic-Cartesian model. The problem of the external world became, thereby, a crucial issue for those concerned with skepticism, because it was thought of as a skeptical problem. Following his lead, many other philosophers in Brazil, like Paulo Francisco Estrella Faria (2007), Luiz Eva (2001b, 2013b), Alexandre Noronha Machado (2007a), Flávio Williges (2007), among others, wrote papers on the topic.