One of the primary changes of SCORM from version 1.2 to version 1.3 (2004) was the introduction of the Sequencing Definition Model (described in the SCORM Sequencing and Navigation book).
The SCORM Sequencing Definition Model is a "declarative information model" derived from the IMS (www.imsglobal.org) Simple Sequencing (SS) specification. The specification is labeled "simple" because it defines a limited number of widely used sequencing behaviors, not because the specification is itself simple.
The SCORM Sequencing model defines how the IMS Simple Sequencing specification is applied and extended in a SCORM environment. This includes how SCORM content packages will define their sequencing (in the manifest), and how a SCORM-conformant LMS must process sequencing information at run-time.
Why do I need Sequencing?
As a SCORM developer, why do I care about sequencing? Essentially, if you want to define a learning "experience" for your SCORM content, you need to define sequencing.
SCORM Sequencing is the answer to the question: "How will a learner experience my learning content?"
