FIGURE 2-10
Relationship between essential requirements and technical requirements.
?«usabilityRequirement?»
Central unit display and
keypad
?«functionalRequirement?»
Navigation system
?«functionalRequirement?»
Phone
req [package] Requirements [essential/technical]
Technical Requirements
Essential Requirements
?«usabilityRequirement?»
Enclosure size of central unit
id???REQ13???
text???The system has to be
operated by the driver during
driving.???
?«usabilityRequirement?»
Operability during driving
?«functionalRequirement?»
Radio
?«functionalRequirement?»
Comfort functions
?«deriveReqt?»
?«deriveReqt?»
PROJECT DIARY
Project Time 5735
I have to be careful in this early project phase that my team won ??™ t fall into the
feared analysis paralysis.
If a team gets infected by this illness they will add requirements and analyze
and analyze and analyze and ??¦ The question is how much requirements analysis
will be sufficient. When is the analysis complete?
45
2.3 Modeling the System Context
Rather than fulfilling an end in itself, the system supplies services to its environment.
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