This document discusses the organization and components of distance education systems. It describes different models for organizing distance education institutions, from single mode institutions devoted entirely to distance education to dual mode institutions that offer both online and in-person courses. It also outlines the key components of a functional distance education system, including sources of content knowledge, course design, delivery of materials, instructor interaction, learner environments, and management/administration. Finally, it advocates viewing distance education as an interconnected system and discusses how this systems perspective helps understand the changes brought about by online learning.