3D Virtual Worlds hold great potential for delivering situated and collaborative education and training. Designing instructional events for virtual worlds, however, requires new competencies for even the most experienced instructional systems designers. The environments, the courses, and the interactions are limited only by the imagination of the instructional designers and their support teams—opening up an array of new opportunities for learning. Since their inception, Robert Gagné's Nine Events of Instruction have been used as a model for many types of training and a variety of learning modalities. The increasing popularity of virtual worlds raises the question of whether or not Gagné's events currently are, or can be, applied to training sessions delivered in 3D Virtual Worlds. This paper reviews Gagné's Nine Events and examines the use of these events in training sessions offered in 3D Virtual Worlds. In addition, this paper addresses best practices and recommendations for designing 3DVW training courses by investigating the applicability of classic learning theory to this new instructional medium.