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5Chapter
Requirements Risk
Management
What Is Requirements Risk Management?
To motivate the notion of requirements risk, here is a vignette.* On a road that the
author travels, he passes a strange street sign that declares “End brake retarder pro-
hibition.” e meaning of this sign is hard to understand, and is blurred by the
curious use of a quadruple negative (each word in the directive has the connotation
of stopping something). As it turns out, this sign is an exquisite example of a “shall
not” requirement as well as illustrating a poor requirements specification, namely,
one that is ambiguous, vague, contradictory, incomplete, or contai