Books for you

What? Describe the system ??™ s interfaces versus the actors with regard to the individual
interaction points.
How? Derive the interfaces from the system/actor interactions and model them at the
system ports.
Where? The system interfaces represent ??? contracts ??? the system enters into with its
actors.
Guiding questions
?–  What services are offered over the interaction points?
?–  What services are requested over the interaction points?
?–  What data fl ows across the interaction points?
SysML elements
Block defi nition diagram, interface.
Derive system
interfaces
System context
[interfaces]
Interaction model
[system/actor] System context
[interaction points]
115 2.7 Realizing Use Cases
We can see in Figure 2.71 that the system receives the message apply card
from the actor customer . This means that the system offers a service to a customer.
So, the interaction point from within the system context is a standard port.
This service is described with an interface called ICustomer and denoted with
the lollipop notation ( Figure 2.


Pages:
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257