Few subjects have troubled courts more and legal writers less than faulty assignments of error. Since the subject has received little attention outside the reports themselves, there has developed a mass of hitherto unassimilated case authority which, because of its size, is an obstacle rather than an aid to courts and attorneys. This article is the product of a survey of those cases. It will add little to the general store of information on the subject, but it is designed to do two things: (1) call the attention of the Bar to some of the clearer and better written discussions of the problem in the Washington cases, and (2) to segregate, throughout the footnotes, the particular decisions dealing with specific problems posed by the requirement that all briefs contain an assignment of the errors relied upon for reversal