For philosophic reasons, such authors might modify or reject verifiability, falsifiability, and logical non-contradiction. Chromotherapy has also been criticized for its lack of falsifiability and verifiability. These claims vary in verifiability and objectivity. Inclusion based on prominence is expedient for its objectivity and verifiability, but has its drawbacks. Logical positivists within the Vienna Circle recognized quickly that the verifiability criterion was too stringent. This system espoused conclusive verification, yet accommodated for probabilistic inclusion where verifiability is inconclusive. The verifiability criterion of meaning was itself unverified. Inferred aspects are privacy, anonymity and verifiability. Verifiability, accuracy, and openness to criticism are central tenets of historical scholarship. Emerging properties such as privacy, traceability and verifiability can also be considered. Reliability and verifiability of the information is variable. It is from the latter that the former derives its validity, verifiability, and truth value. Ayer also distinguishes between practical and theoretical verifiability. This is referred to as the "verifiability" criterion. Wittgenstein's influence also shows in some versions of the verifiability principle.