An important property of an engineering requirement that we saw earlier was verifiability. verifiability seeks to answer the question of whether or not the system is being developed cor- rectly, or "are we building the product correctly? " a related concept is that of validation, which seeks to answer the question "are we building the correct product? " more formally, validation is the process of determining whether the system meets the needs of the user—is it valid? this is more general in scope than verification and more difficult to show. require- ments validation is usually carried out by reviews of the requirements by a team of people. validation is demonstrated by being able to answer the following questions in the affirmative