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How to calculate Software Quality

Attributes

In continuation to my previous post Software Quality Attributes, Im here writing someof the formulas of the various Software Quality Attributes:

1. Correctness: Extent to which a program satisfies its specifications and fulfills theusers mission objectives. It can be calculated as

= (No. of non-conformance to requirements / Total no. of requirements)*100

Correctness can also be calculated as

= (No. of requirements fulfilled) / (Total no. of requirements) * 100

2. Reliability: Extent to which a program can be expected to perform its intended

function with required precision. The formula of reliability is

= (Mean Time To Failure) / (Total Run Time) * 100

It can also be calculated as

= (Mean Time Between Failure) / (Total Run Time) * 100

3. Efficiency: The amount of computing resources and code required by a program to

perform a function.

Efficiency = (Memory Usage) / (Total Memory) * 100

4. Integrity: Extent to which access to software or data by unauthorized persons can be

controlled.

Integrity = (No. of successful attempts) / (Total no. of attempts) * 100

5. Usability: Effort required learning, operating, preparing input, and interpreting output

of a program.

Usability = (Total Training Time) / (Total development time) * 100

6. Maintainability: Effort required locating and fixing an error in an operational

program.

Maintainability = (Time spent to fix a bug) / (Total development time) * 100

http://www.qasigma.com/2008/12/software-quality-attributes.htmlhttp://www.qasigma.com/2008/12/software-quality-attributes.htmlhttp://www.qasigma.com/2008/12/software-quality-attributes.html

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