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PETRUCHIO: And, for an entrance to my entertainment,
I do present you with a man of mine,
[Presenting Hortensio.]
Cunning in music and the mathematics,
To instruct her fully in those sciences,
Whereof I know she is not ignorant:
Accept of him, or else you do me wrong:
His name is Licio, born in Mantua.—The Taming of the Shrew, II, i, 54–60.
Previous chapters have addressed the topic of assurance in general and have described how assurance can be acquired throughout the life cycle of a product or system. To this point, the methods and techniques that have been discussed have been informal in nature and dependent on documentation and written requirements statements for design assurance and on testing for implementation assurance. Chapter 19, "Building Systems with Assurance," introduced the concepts of formal specification languages for specifying requirements and systems as well as mathematically based automated formal methods for proving properties of specifications and programs. This chapter discusses these topics more fully, examining past and present formal specification and proof technologies.
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