 Neo-Pyrrhonism has two parts: one negative, and the other positive. The two most important concepts of the negative part are diaphonía (the conflict among the various philosophical doctrines) and epokhé (the suspension of judgment). For Porchat, ataraxía, or tranquility of mind, is not an essential ingredient of Pyrrhonism and it is more of historical interest. Given the conflict of philosophies, Porchat draws the skeptical conclusion: being genuinely unable to choose between the various philosophical views, he suspends his judgment. He argues vigorously that the disagreement between philosophies is undecidable. Not even his previous “philosophy of the common view of the world” (Porchat 1975, 1979) is able to solve or avoid the conflict. The conflict involves the dogmatism not only of philosophers of the common view of the world, but also of ordinary people. However, not all philosophies are part of the conflict, since some philosophies are not dogmatic: they do not intend to describe the ultimate nature of things.