René Descartes published Discourse on the Method in 1637, presenting a systematic approach to reasoning. The French work, whose full title means “Discourse on the Method of Rightly Conducting One’s Reason and of Seeking Truth in the Sciences,” was published in Leiden, in the Dutch Republic.
Descartes proposed examining beliefs through methodical doubt rather than accepting inherited authorities automatically. His method is often summarized by four principles: accept only what is clear and distinct, divide difficult problems into parts, proceed from simple ideas to complex ones, and review the reasoning carefully. The work is also associated with the famous idea “I think, therefore I am,” although the best-known Latin wording appears in later works.
The Discourse served as an introduction to three scientific essays: La Dioptrique, Les Météores, and La Géométrie. The last helped establish analytic geometry by linking algebra with geometric figures. A common mix-up is attributing the entire modern scientific method to Descartes alone; his approach was influential, but experimental science developed through contributions from many thinkers, including Galileo, Bacon, and Newton.