Mr. Derrida was known as the father of deconstruction, the method of inquiry that asserted that all writing was full of confusion and contradiction, and that the author's intent could not overcome the inherent contradictions of language itself, robbing texts - whether literature, history or philosophy - of truthfulness, absolute meaning and permanence. The concept was eventually applied to the whole gamut of arts and social sciences, including linguistics, anthropology, political science, even architecture."
more here.
i list this, btw, not because i was (or indeed, am) a huge derrida fan, but because he changed things.