Rapid authoring tool
Authoring tool used to create courses and tutorials, generally by converting PowerPoint files or Microsoft Word documents, or by recording software applications in use.
RLO
Acronym: Reusable Learning Object. See "Learning Object"
ROI
Acronym: Return on Investment. See tutorial: "Return on Investment Calculation."
RSS
Acronym: Real Simple Syndication. Method for distributing content, including media files, to subscribers over the Internet.

