Edmund Husserl is the founder of phenomenology, and the Logical Investigations is his most famous work. It had a decisive impact on twentieth century philosophy and is one of few works to have influenced both continental and analytic philosophy. Husserl's Ideas offers a detailed introduction to the phenomenological method, including the reduction, and outlining the overall scope of phenomenological philosophy. Husserl's explorations of the a priori structures of intentionality, consciousness, perceptual experience, evidence and rationality continue to challenge contemporary philosophy of mind.