An introduction to life span motor development. This third edition reflects developments in research findings and has been expanded to present topics from a unifying model of constraints approach. Students should learn not only how to look at the individual but also at the task and the environment to fully understand the factors affecting motor development. In addition, a life span approach has been integrated throughout the text. The text includes the following features: real-life vignettes applying to each chapter's content; a running glossary of terms in the margins, which provides definitions where students need them; interactive reflection questions throughout the text to help students master the material and test their learning as they go; assessment boxes to ensure that students learn about evaluation techniques and instruments in a consistent way; a list of objectives opening each chapter; and chapter summaries. Popular features from the second edition have been retained, including: discussion questions at the end of each chapter; concept summaries throughout each chapter; and an index of key terms at the end of each chapter.