Pressley examines the research on literacy that has been contributed by psychologists. The chapter is organized along developmental lines, beginning in late infancy and proceeding through adulthood. Following the emphasis in pre‐ and early elementary school, there is a focus on the development of language and letter‐ and word‐level competencies in reading and writing. Next, is a focus on the development of fluent reading, vocabulary, then on comprehension and composition, and finally on advanced literacy skills essential to meet the learning demands of secondary and post‐secondary education. Adult literacy is reviewed in the final section, stressing research on what works for adults who did not develop literacy competencies.