Page 684 - The Mechatronics Handbook

Network Printer

Print
user

Setup

System
Administrator
Maintenance
Maintenance
Technician

FIGURE 22.2 Use case diagram for a network printer.

User Network Printer

check availability

<2 s
confirm
availability

<10 s
send page

<60 s
confirm
completion

FIGURE 22.3 A sequence diagram for network printer use.

provide information about the nature of the transaction, but rather documents its existence. It serves as
a top level model of a system only.
Sequence diagrams can be drawn to describe the details of individual use cases in order to clarify the inter-
actions that must occur, timing constraints, and interactions between the system and multiple elements of
the environment. Figure 22.3 shows an example of a sequence diagram for the “print” use case of Fig. 22.2.

©2002 CRC Press LLC