Shareable Content Object Reference Model (SCORM) is a collection of standards and specifications for web-based electronic educational technology (also called e-learning). It defines communications between client side content and a host system (called "the run-time environment"), which is commonly supported by a learning management system. SCORM also defines how content may be packaged into a transferable ZIP file called "Package Interchange Format." SCORM is a specification of the Advanced Distributed Learning (ADL) Initiative from the Office of the United States Secretary of Defense. SCORM 2004 introduced a complex idea called sequencing, which is a set of rules that specifies the order in which a learner may experience content objects. In simple terms, they constrain a learner to a fixed set of paths through the training material, permit the learner to "bookmark" their progress when taking breaks, and assure the acceptability of test scores achieved by the learner. The standard uses XML, and it is based on the results of work done by AICC, IEEE LTSC, and Ariadne. Technology SCORM was designed to be web-based and utilizes JavaScript to facilitate communication between the client side content and the run-time environment. Each SCORM version specifies the methods that the run-time environment should support and how those methods should behave. Content launched by the run time environment can then call those methods utilizing JavaScript. Versions SCORM 1.1 It was the first version of SCORM. These early adoptions revealed that the SCORM idea was workable, but it needed to be sufficiently robust for widespread implementation. SCORM 1.2 This was the first version that was widely used. It is still widely used and is supported by most Learning Management Systems. SCORM 2004 This is the current version. It is based on new standards for API and content object-to-runtime environment communication, with many ambiguities of previous versions resolved. Includes ability to specify adaptive sequencing of activities that use the content objects. Includes ability to share and use information about the success status for multiple learning objectives or competencies across content objects and across courses for the same learner within the same learning management system. A more robust test suite helps ensure good interoperability. SCORM 2004 editions 3rd Edition (October 2005) – clarification of various conformance requirements and of the interaction between content objects and the runtime environment for sequencing; some new conformance requirements to improve interoperability. 4th Edition Released (March 31, 2009) – more stringent interoperability