Upd
ates
Updates
Upda
tes
PDM
PDM
PDM
Control Centre
Registry office
Parking-White-List
Resident-parking
Purchase (^) tiocfk teimtse-parking (^) registration
Parking enforcement
Registered residents
Monitoring Centre
Do
wn
loa
d
Time
parking
Info.
Figure 73 : Context diagram of the PBL IoT system. The dashed box indicates the
border of the Control Centre (photography taken from [Korbach 2011])As described in Section 5.2.4.2, the context view describes ―the relationships,
dependencies, and interactions between the system and its environment‖
[Rozanski 2011]. While we describe some inner structure of the envisaged
system, viz. an enhanced version of the Control Centre, this level of detail is not
mandatory. What is mandatory though is to provide an information about (see
[Rozanski 2013] (homepage/entry on context viewpoint at
http://www.viewpoints-and-perspectives.info/home/viewpoints/context/))
system scope and responsibilities
identity of external entities and services and data used
nature and characteristics of external entities
identity and responsibilities of external interfaces
[nature and characteristics of external interfaces]
other external interdependencies
[impact of the system on its environment]
[overall completeness, consistency, and coherence]
Note that for the sake of brevity of this section we will ignore the aspects
between brackets.
The nature of external interfaces was not addressed since this information was
not available at the time of writing. Besides the mission statements in Section
5.3.1 we cannot yet predict how this system impacts its environments. This
question can often only be addressed when the system is implemented and
tested. The overall completeness, consistency, and coherence of the system
was not addressed here, since, due the simplicity of the use case, and the
strong boundaries put onto it by the business model (for instance, off-street