This course addresses the technologies associated with the development of nuclear weapons. The course provides a basic background in the physics of nuclear weapons technology, including the fission and fusion processes, nuclear reactors, the criticality condition and the materials needed for nuclear weapons. The paths that can be taken in developing nuclear weapons are considered. The differences between radiological devices ("dirty" bombs) and critical devices are addressed. Additional topics of the workshop include radiation detection, uranium enrichment, nuclear fuel reprocessing, nuclear weapons types and weapons effects.