OER Handbook at the WikiEducator
"The term 'Open Educational Resource(s)' (OER) refers to educational resources (lesson plans, quizzes, syllabi, instructional modules, simulations, etc.) that are freely available for use, reuse, adaptation, and sharing.
The term 'open educational resources' was first used in July 2002 during a UNESCO workshop on open courseware in developing countries (Johnstone, 2005). Most definitions of the term include content, software tools, licenses, and best practices. OER is a burgeoning field of practice and exploration as evidenced by the growing number of research studies including the OECD (2007), OLCOS (2007), and Hewlett Foundation (Atkins, Brown and Hammond, 2007) reports. There is an emerging research community gaining momentum and focusing on investigating the impact of OER on learning and the education environment."