This two-week workshop, held at COMET in Boulder, CO, is a hands-on experience for representatives of Regional Training Centers to develop their own online WMO Basic Hydrologic Sciences Online Course. Working in a Moodle course environment, participants will design and build a course site that meets their regional needs. The workshop introduces participants to Instructional Systems Design and learning theory through discussions and activities and provides the understanding and techniques necessary to deliver an engaging and effective course.