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.