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Saturday, August 20, 2005

ISO9126 Software Quality Attributes

ISO/IEC 9126 provides a framework for the evaluation of software quality.

It defines six software quality attributes, also called quality characteristics:
  • Functionality: are the required functions available, including interoperabilithy and security
  • Reliability: maturity, fault tolerance and recoverability
  • Usability: how easy it is to understand, learn, operate the software system
  • Efficiency: performance and resource behaviour
  • Maintainability: how easy is it to modify the software
  • Portability: can the software easily be transfered to another environment, including installability
Almost all these attributes are non-functional. However it is not uncommon that software requirements and testing activities are mostly focused on functionality. Problems with nonfunctional requirements detected late in the project can have a major impact on the schedule. Often significant changes have to be done on the architecture to resolve non-functional quality issues.

Use quality attributes to specify the required product quality, both for software development and software evaluation. For example select the top 3 attributes and define them Specific, Measurable, Acceptable, Realisable, and Traceable (SMART).

Do you give enough attention to the non-functional requirements of your development project, and are you using the relevant review and testing techniques to verify and validate the non-functional requirements ?

3 Comments:

Anonymous Anonymous said...

Can anybody provide more info on it. specifically measurable participation of each attribute to quality.
...AT

Thursday, July 12, 2007 7:11:00 PM  
Anonymous Anonymous said...

Broadly sw quality attributes are divided into 2 categories.
internal
external
internal attributes includes correctness,accessibility,efficiency,integrity,adaptability etc.
external attributes includes maintainability,flexability,portability,understandability etc.

Saturday, September 15, 2007 8:06:00 AM  
Anonymous Misbah Mehboob said...

Broadly sw quality attributes are divided into 2 categories.
internal
external
internal attributes includes correctness,accessibility,efficiency,integrity,adaptability etc.
external attributes includes maintainability,flexability,portability,understandability etc

Saturday, September 15, 2007 8:11:00 AM  

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