This paper starts a discussion of the process of extensive reading (ER) program implementation in schools from a functional perspective. It discusses some considerations that may have hindered the spread of ER into the public school systems of many countries. It makes an argument for a top-down approach being required for widespread implementation as well as the need for materials other than graded readers, which while being the gold standard for ER, cannot realistically be purchased by and managed in a large school system. The impact on student choice of what to read is also discussed. The paper ends with suggestions for a way forward.