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Figure 2-8: Activity diagram example 
2.3.6
 
Implementation Diagrams 
Implementation diagrams come in two forms, component diagrams and deployment 
diagrams. Component diagrams show the dependency between components. A 
component may be modules in a system. See Figure 2-9 below for a component diagram. 

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2.4 Background information: : Case description: TMMS Service 
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Deployment diagrams show the structure of the nodes on which the components are to 
be deployed. See Figure 2-10 below for an example of a deployment diagram for the 
same Air Traffic Control system. 
Air Traffic Control
Database 
System
Baggage 
System
Flight 
Scheduler
Figure 2-9: Component diagram example 
Database 
server
Air Traffic 
Control
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Figure 2-10: Deployment diagram example 
Note that the deployment diagrams used in the report have different graphics, but the 
semantic of them are equal. 
2.4
 
Case description: TMMS Service 
2.4.1
 
Use case view 
First all the actors of the system are presented, and then the use cases for each actor are 
described. 
2.4.1.1
 
Actors 
The following table describes the actors which are part of the TMMS Service. 

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2.4 Background information: : Case description: TMMS Service 
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Table 2-1 RPR Actor descriptions 
Actor 
Description 
The PR is responsible for relaying messages 
from sending client to destination client. 
A client must first contact a service operator to 
get access to TMMS. 
A user with a TMMS-enabled device. 
A user with a GSM SMS device.