Chapter 12 - FIT CRITERIA AND RATIONALE
SCALE OF MEASUREMENT - The scale of measurement is the unit you use to test the conformance of the product to its requirement. For a usability requirement, you can measure the time needed to learn product, or the time taken before achieving a particular level of competence, or perhaps even the error rate of the work done using the product. FORMS OF FIT CRITERIA - Defining the Data - D efining the data is to define each term as part of the fit criterion of each individual requirement. Graphic Fit Criteria - When writing fit criteria, the aim is to be as implementation neutral as possible, thereby giving the designers and developers the maximum amount of freedom in choosing how to meet each requirement. Decision Tables - fit criterion defines the rate of discount that a customer should have depending on how long he has been a customer, what his cumulative spending is, and whether he is a member of the customer loyalty program. USE CASES AND FIT CRITERIA - A...