This tutorial book presents seven revised lectures given by leading researchers at the 4th International School on Functional Programming, AFP 2002, in Oxford, UK in August 2002. The lectures presented introduce tools, language features, domain-specific languages, problem domains, and programming methods. All lectures contain exercises and practical assignments. The software accompanying the lectures can be accessed from the AFP 2002 Web site. This book is designed to enable individuals, small groups of students, and lecturers to study recent work in the rapidly developing area of functional programming.