Mark Goodacre, of NT Gateway (and Duke Univ.), has posted a piece articulating what is wrong with present day redaction criticism, a tool used in biblical studies. As explained by Encyclopdia Britannica Online:
Redaction criticism concentrates on the end product, studying the way in which the final authors or editors used the traditional material that they received and the special purpose that each had in view in incorporating this material into his literary composition. It has led of late to important conclusions about the respective outlooks and aims of Matthew, Mark, Luke, and John.
Professor Goodacre is not dismissive of redaction criticism, but he stresses its limitations and the problems it must overcome to be useful. The post is short, to the point, and persuasive.