when adl was established, the use of learning management systems (lmss) was increasing rapidly, but the content delivered through those systems remained separated (locked into silos). for example, while the navy and army have standard courses with similar content, that content could not be shared and reused from one service to another because their lmss would not allow it. the silo’d nature of content delivered through lmss was not cost efficient, and became one of adl's first challenges to tackle resulting in the development of the scorm (sharable content object reference model).