NUS-IRB defines research as a systematic investigation, including research development, testing or evaluation designed to develop or contribute to generalizable knowledge. Such activity may or may not differ in any significant way from customary medical or other professional practice. Educational exercises involving human participants that are not construed as "research" (e.g., class demonstrations and exercises that do not lead to publishable materials) do not require ethics review, unless otherwise required by the Faculty or Department Heads. The intent to publish is usually one criterion for a project to be considered research. Most reputable journals would require the research to be reviewed by the IRB before they will agree to publish the results of the research.