A review of research literature on the subject of dyslexia printed since 1955 is presented, concentrating on the interest in the subject during the late 1960's. The authors initially admit that precise definition of the term dyslexia is quite impossible (they use the term to mean the inability to read) and devote chapters to describing problems related to definitions, problems of diagnosis, and treatment approaches to dyslexia. By taking this approach, the authors propose to construct an analytic framework for use by future theorists and researchers. The monograph is one of a series of ERIC/CRIER "state-of-the-art" papers, and is thus intended to be a review of research in a general area with conclusions about the present state of knowledge in that area and discussion of implications for future research. Selected annotated references are included. (MS)