Doubt occupies a central place in the philosophical system of Rene Descartes. R. Descartes saw doubt not only as distrust and hesitation, but as the initial and necessary stage of obtaining true knowledge. R. Descartes' methodological doubt distances a person from thinking far from logical analysis. It allows you to carefully filter every thought and accept only clear, accurate and substantiated knowledge. Methodological doubt is important not only for the improvement of philosophical thinking. It is also important for justifying the process of arriving at correct conclusions in scientific research.

R. Descartes believed that a universal method can be applied in all fields of knowledge, both in philosophy and in science. The method of doubt is based on the principles of analysis, synthesis, clarity and precision. It directs human thought systematically and consistently. According to R. Descartes, the value of knowledge depends not on its source, but on the systematicity of the method applied. Science and philosophy are not separate from each other, both are built on the same methodological basis.

R. Descartes' methodological doubt played a decisive role in the formation of research and evidence-based science. If there were no such principle, scientific knowledge would still develop based on religious and philosophical authorities. R. Descartes's doubt, principles of sequential analysis and clarity form the basis of modern scientific research culture. They play a revolutionary role in the systematic understanding of the human mind. R. Descartes' philosophical and methodological iris plays a role in the basic principles of both classical and modern scientific thought.