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Chapter 12 (Harpreet Singh Brar)


Fit -  Here the term Fit means a solution that completely satisfies or matches the requirements. It is the solution that does exactly what the requirements says it must do or has the property the requirement says it must have no more and no less. The measurement of the requirement is its fit criterion.

Why does Fit need a Criterion?

There is a testing activity that demonstrates what the product does, how that product performs a function or posses the desired property. To carry out this activity, the requirements must have a benchmark so that testers can compare the delivered product with the original requirement. The benchmark is the fit criterion, which is a quantification of the requirement that demonstrates the standard to which the product must reach.


Comments

  1. Aziz DhillonDecember 5, 2018 at 6:42 PM

    The fit criterion is needed because some requirements are too vague or ambiguous to be properly useful. For example, for the website we presented for the North West Company, “The product shall be easy to use” is well-aimed, but not yet able to be implemented. However, if we add a fit criterion such as “75% of first-time users shall be able to buy the correct products within 90 seconds, without using the help functionality” makes it clear to the designer what is needed to make the product successful. You negotiate the fit criterion with the appropriate stakeholders, and writing it helps you to discover the real intention for the requirement. You can also think if the fit criterion as the input conditions for the eventual test of the software, rather than the test itself.

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