This note introduces basic principles of organizational design and the advantages of several common organizational structures. The principles of design are fit, differentiation, integration, technology, size, span of control, staffing, unity of command, and line versus staff. The structures diagrammed and described are functional, product, customer, geographic, divisional or M-form, matrix, amorphous, and hybrids. The note also discusses the new emerging Information Age organizational forms, which the authors call "infocracies."