The Shareable Content Object Reference Model (SCORM) defines standards for learning content and learning management systems to ensure interoperability. It has gone through several versions since being released in 2000 that build upon the previous versions. SCORM governs how online training content can be packaged and communicated between a learning management system and user, ensuring training content can be used across different systems without modification. The most recent version, SCORM 2004 3rd Edition, further clarifies previous standards and incorporates changes from other related specifications to provide a comprehensive set of e-learning capabilities for interoperability, accessibility and reuse of online training content.