Chapter 6. Qualitative and Quantitative Types of Performance Requirements

System performance requirements often state that a given load shall be sustainable by the system, and that the system shall be scalable, without specifying the meaning of sustainability and without specifying the dimensions in which a system is to be scaled, and what successful scalability means in terms of system performance and/or in terms of the number of objects encompassed by the system. In this chapter we shall describe the expression of performance requirements in quantitative, measurable terms. We shall show how they can be used to reformulate qualitative requirements in terms that meet the criteria for sound performance requirements, such as being measurable, testable, ...

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