Design of open content object and its run-time environment based on SCORM specification

On the basis of analyzing the characteristics of the current distance education technology specifications,a components model of open content object was put forward that can provide a more flexible and effective method for the design of the interoperable structure and sequence of web-based learning content.In this model,the learning content components were designed to be open content object that had the function of requesting services and providing services by messages transferred mechanism,thus the content components can not only be aggregated to compose higher-level units of instruction,but also can form the interoperable associational relationship by the messages transferred mechanism which takes the learning management system as the scheduling center of messages.Finally,a common run-time environment for open content object running between different learning management systems was designed by extending the run-Time environment of the sharable content object reference model(SCORM).