Speech and Phenomena: And Other Essays on Husserl's Theory of Signs, or Voice and Phenomenon: Introduction to the Problem of the Sign in Husserl's Phenomenology, (French: La Voix et le Phénomène) is a book about the phenomenology of Edmund Husserl by the French philosopher Jacques Derrida, published in 1967 alongside Derrida's Of Grammatology and Writing and Difference. In Speech and Phenomena, Derrida articulates his mature relationship to Husserl, putting forward an argument concerning Husserl's phenomenological project as a whole in relation to a key distinction in Husserl's theory of language in the Logical Investigations (1900–1901) and how this distinction relates to his description of internal time consciousness. Derrida also develops key discussions of the terms deconstruction and différance. Derrida commented that Speech and Phenomena is the "essay I value the most". Derrida's best known work on Husserl's phenomenology, it is widely considered one of his most important philosophical works. Source: Wikipedia (en)