Publisher Summary This chapter is motivated by an attempt made by the International Council on Systems Engineering (INCOSE) Verification and Validation Working Group in 2006 to move toward a commonly accepted pair of meanings for the “V” words: validation and verification. The chapter offers a method for arriving at a condition of agreement in the system engineering profession about the meaning of these V words. The meaning of these words is a concern to people in the system engineering profession. Many alternative meanings have been applied on programs and within organizations. Three solutions to this problem are considered in the chapter: (1) do nothing and permit each program or organization to define the words as they want, (2) let INCOSE select its own definitions regardless of their relationships with those offered from other respected sources and try to tough it out over time as one more authoritative source weighing in on the matter, and (3) let INCOSE become an honest broker among the parties that offer conflicting definitions. The chapter concludes with a discussion of concept validation, requirements validation, and the details of the verification process.