This article presents a methodology for developing learning objects for web-based courses using the IMS Learning Design (IMS LD) specification. We first investigated the IMS LD specification, determining how to use it with online courses and the student delivery model, and then applied this to a Unit of Learning (UOL) for online computer science courses. We developed an editor and runtime environment to apply the IMS LD to a UOL. We then explored the prospect for advancement of the basic IMS LD UOL. Finally, we discussed how to construct ontology-based software agents to use with the learning objects created with the IMS LD Units of Learning.