Given the relatively high costs associated with designing and implementing learning designs in virtual worlds, a strategy for the re-use of designs becomes imperative. IMS LD has emerged as the standard for the description and expression of learning designs. This chapter explores some of the issues associated with using the IMS LD specification for learning designs in virtual worlds such as Second Life and multi-player online role playing games such as World of Warcraft. The main issues relate to the inadequate description of collaborative activities and the inability to alter the design 'on-the-fly' in response to learner inputs. Some possible solutions to these problems are considered. © 2011, IGI Global.