The key work of the founder of phenomenology - one of the leading directions of modern thought, which analyzes the immediate data of consciousness - is a detailed introduction to phenomenological problems. The book substantiates the understanding of phenomenology as a pure science, philosophical method and mental attitude. Traditional philosophical questions about perception and experience, consciousness and thinking, mind and reality unfold in an original way. With German thoroughness, Husserl examines the features of phenomenological reduction, the doctrine of noema and noesis, the position of transcendental idealism. The text of the book was translated from the original language using an artificial intelligence program. For the most part, the translation of the text is of very high quality, but in some cases, due to the imperfection of the technology, there may be incorrect phrase translations in the text, as well as single words and expressions may not be translated.