Books for you

Model system/actor
interaction
System context
Use cases
Interaction model
[system/actor]
113 2.7 Realizing Use Cases
with the use case fl ows??”and adds information about the communication
between the participants.
Our interaction modeling effort has primarily the goal of identifying the system
interfaces, which we will do in the next step (Section 2.7.2). In the step after
that we will trace the messages arriving at the system and leaving the system, and
we will build the required system structures.
How do we create a sequence diagram? First thing we take a use case, e.g.,
start car usage . The system and the participating actors are the interactions partners
to be shown as lifelines in the sequence diagram. What we ??™ ll do is we model
a concrete scenario only, excluding all exceptions and variants, as we did in the
use case activities. We pick the standard fl ow??”the positive case. We translate this
fl ow from the activity to the sequence diagram. We draw messages that describe
the communication between the lifelines.


Pages:
230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254