What is the relationship of JSP to JSD? Are JSP diagrams and JSD diagrams the same thing?
JSD evolved from JSP, and includes JSP. So JSP is a part, or subset, of JSD. Or you can think of JSD as an extension, or superset, of JSP. JSD has several diagram types. One of the diagrams, called the action structure diagram or entity life history diagram is a JSP structure diagram put to a new use. In JSP, structure diagrams are used to describe data structures and program structures. In JSD, they are used to describe the lifecycle of real-world entities. The difference is not as great as you might first think. In JSD, it is often the case that each event in the life of a real-world entity generates a message that is sent into the information system. So the structure of events in the life of the real-world entity, and the data structure of the stream of event-messages that the real world entity sends into the information system, are the same. JSD includes a number of diagrams that are not a part of JSP, including the network structure diagram and the system implementation diagram.
