[14] “Nodes and links are the basic building blocks of multimedia systems. Nodes are information units within a multimedia system. Links are the way these information units are physically and conceptually connected and interrelated…..Multimedia nodes may be accessed, if supported with the appropriate links, in any sequence that meets the information needs and interests of the user. Rather than coming across a continuous linear flow of information, such as that found in books or videotapes, multimedia systems chunk information into nodes and establish connections between the different nodes. This is called modularising the information in a program. Modularisation enables users of multimedia systems to determine for themselves which node to access next.” (Kommers P A M, Grabinger S & Dunlap JC (1996) Hypermedia Learning Environments, LEA, Mahwah, New Jersey, p  Allyn & Bacon, Needham Heights, Massachusetts, p 79)