Several certification programs exist to support the professional aspirations of software testers and quality assurance specialists. No certification now offered actually requires the applicant to show their ability to test software. No certification is based on a widely accepted body of knowledge. This has led some to declare that the testing field is not ready for certification. Certification itself cannot measure an individual's productivity, their skill, or practical knowledge, and cannot guarantee their competence, or professionalism as a tester.

Answer this question, if possible (if impossible, reply "unanswerable"): With several certifications out there that can be aquired, what is the one trait they all share?
requires the applicant to show their ability to test software