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req [package] sizes [enclosure for central unit]
?«requirement?»
Enclosure size central unit
?«requirement?»
id???REQ2.1???
text???The central unit of the on-board computer has to fit into a
DIN compartment.???
?«rationale?»
The on-board computer has to be built into the
car??™s radio compartment.
41
Requirements can be grouped into various categories. One example for categorizing
requirements is the FURPS model developed by Robert Grady (Hewlett-
Packard) [19]:
?–  Functionality ??”functional requirements.
?–  Usability ??”usability requirements, e.g., usage concepts, corporate identity.
?–  Reliability ??”reliability requirements, e.g., failure frequency.
?–  Performance ??”quantifi able requirements, e.g., response times, speed,
bandwidth.
?–  Supportability ??”testability, confi gurability, installation, service.
There are other categorization catalogs, including the one by Robertson [38],
which also describes categories like policies , operation , and security , among other
things; or the quality characteristics defi ned in ISO/IEC standard 9126 [23].


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