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Bare what is essential functionality necessary to demonstrate the simplest use of the feature?NecessityCapability, what would make this feature useful in more situations? What would allow the feature to be used in alternativeFlexibility ways?Safety what would make this feature safer for me to use for the user or other stakeholders? These are characteristics that help prevent errors or validate data to prevent bad information from entering the system.Usability, what would make this feature more desirable to use? This includes adjustments to improve usability, visualPerformance, and interaction design improvements to estheticSex Appeal appeal, and improvements that help users do their work faster including architectural improvements or 19 features such as short cuts or speed keys.
Bare Necessity Example: A form with only necessary ﬁelds and no validaFon Capability & Flexibility Example: a form with opFonal ﬁelds, date lookup tools, input translaFon on dates Safety Example: input validaFon, enforcement of business rules such as credit card validaFon Usability, Performance, Sex Appeal Example: auto-‐compleFon, sexy visual design, speed keys