Chapter 5 Software Engineering

How are activity diagrams used in describing the context of use of a system?

Activity diagrams, may be used to describe the business processes in which the system is used and the other systems which are also used in these processes.

What is the basic assumption that underlies event-driven modeling?

It is based on the assumption that a system has a finite number of states and that events (stimuli) may cause a transition from one state to another.

What is illustrated in a UML sequence diagram?

Show interactions between actors and the system and between system components.

What is described in a context model?

The immediate external environment of the system defining the systems context and dependencies that a system has on its environment.

What UML diagram types may be used to represent the essential features of a system?

a. Activity diagrams, which show the activities involved in a process or in data processing. b. Use case diagrams, which show the interactions between a system and its environment. c. Sequence diagrams, which show interactions between actors and the system and between system components. d. Class diagrams, which show the object classes in the system and the associations between these classes. e. State diagrams, which show how the system reacts to internal and external events.

What perspectives may be used for system modelling?

a. An external perspective, where you model the context or environment of the system. b. An interaction perspective, where you model the interactions between a system and its environment, or between the components of a system. c. A structural perspective, where you model the organization of a system or the structure of the data that is processed by the system. d. A behavioral perspective, where you model the dynamic behavior of the system and how it responds to events.

What are the principal components of a textual use-case description?

a. The actors involved b. A description of interactions c. The data that it exchanges d. The stimulus that triggers the use case e. The response of the system f. Comments and other information