 Whether his ideology informed his understanding of film style, or vice versa, his "Theory of Film Practice" is one of the key works in the canon of Western film theory.In the foreword to the 1980 edition of "Theory Of Film Practice", Burch repudiated some of his earlier theories, expanding on his younger self's limited conception of formalism as applied to the film arts.But, Burch insists the reader "sift out the nuggets that may still lie among the dross".