Does the requirement specify a true need, desire, or obligation?

Have you identified the "root cause" for the requirement?

Is the requirement stated as a complete sentence?

Is the requirement stated entirely in one place, in a manner that does not force the reader to look at additional information to understand the requirement?

Is the requirement unambiguous and not confusing?

Does everyone agree on the meaning of the requirement?

Is the requirement in conflict with other requirements?

Is the terminology used consistent with other requirements and glossary terms?

Can we determine whether the system satisfies the requirement?

Is it possible to define a clear, unambiguous pass/fail criterion?

Is it possible to determine if the requirement has been met via inspection, analysis, demonstration or test?

Is the requirement uniquely identified so it can be unambiguously referenced?

Can the requirement be satisfied within cost and on schedule?

Is the requirement technically feasible with current technology?

Is the requirement physically achievable?

Are all requirements that impose constraints on the design, limiting design options, justified?

Is the requirement stated in such that there is more than one way that it can be satisfied?

Does the requirement statement define exactly one requirement?

Is the requirement statement free of conjunctions (and, or, but) that may indicate multiple requirements?