Quality Attribute

Was bedeutet Quality Attribute?

Das International Software Architecture Qualification Board  (ISAQB) definiert den Begriff „Quality Attribute“ wie folgt:

Unter Quality Attribute versteht man „

Software quality is the degree to which a system possesses the desired combination of attributes (see: software quality).

The Standard ISO-25010 defines the following quality attributes:

<ul
<li
Functional suitability</a
<ul

Functional completeness</li

Functional correctness</li

Functional appropriateness</li
</ul
</li
<li
Performance efficiency</a
<ul

Time behaviour</li

Resource utilization</li

Capacity</li
</ul
</li
<li
Compatibility</a
<ul

Co-existence</li

Interoperability</li
</ul
</li
<li
Usability</a
<ul

Appropriateness recognizability</li

Learnability</li

Operability</li

User error protection</li

User interface aesthetics</li

Accessibility</li
</ul
</li
<li
Reliability</a
<ul

Availability</li

Fault tolerance</li

Recoverability</li
</ul
</li
<li
Security</a
<ul

Confidentiality</li

Integrity</li

Non-repudiation</li

Accountability</li

Authenticity</li
</ul
</li
<li
Maintainability</a
<ul

Modularity</li

Reusability</li

Analysability</li

Modifiability</li

Testability</li
</ul
</li
<li
Portability</a
<ul

Adaptability</li

Installability</li

Replaceability</li
</ul
</li
</ul<br

It’s helpful to distinguish between:

<ul
<li
runtime quality attributes (which can be observed at execution time of the system),</li

non-runtime quality attributes_ (which cannot be observed as the system executes) and</li

business quality attributes (cost, schedule, marketability, appropriateness for organization)</li
</ul<br

Examples of runtime quality attributes are functional suitability, performance efficiency, security, reliability, usability and interoperability.

Examples of non-runtime quality attributes are modifiability, portability, reusability, integratability, and testability.

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