Student writing achievement is essential to lifelong learner success, but supporting writing can be challenging for teachers. Several large-scale analyses of publications on writing have called for further study of instructional methods, as the current literature does not sufficiently address the need to support best teaching practices. Self-assessment methods in writing instruction present meaningful ways to promote student writing achievement through reflection and meta-cognition during the writing process. Self-assessment practices are described in publications across the academic disciplines where writing is required, and close investigations of the methods are also published in the research fields of literacy, English education and composition. This study aims to bridge these fields to construct a clear and comprehensive understanding of self-assessment methods. Self-assessment encompasses a wide range of practices and varied terminology. It is essential to clarify effective methods of self-assessment and to disseminate practical information to educators. This paper presents the findings of an analysis of the literature yielding: (1) a theoretical framework for self-assessment methods in writing instruction; (2) an overview of concepts/practices; (3) a list of literature-supported strategies for effective classroom use derived from a study of a vast body of literature. Results strongly support self-assessment as a means to foster student writing achievement, middle school through higher education. Delineated strategies can assist instructors with self-assessment implementation.