Are they reliable? Have they been statistically validated?
Research on PST has been on-going since it was originally created in 1978. Both reliability and validity studies have been conducted and the results of these studies are summarized below. The reliability of an instrument refers to the extent to which the assessment results are repeatable or consistent. There have been three separate investigations that have examined the internal consistency of the Perceptual Style scales measured in the PSA. These studies show that the internal consistency of the Perceptual Styles scales within the PSA exceeds the generally accepted level of .70 commonly used to establish reliability. Research on the PST Natural Action Capacities (NACs) scales of the TA revealed that all of the 18 NACs have reliability coefficients that are above the acceptable level of .70. The validity of an instrument refers to the extent to which it measures what it is intended to measure. Psychologists have established three types of test validity – Content, Construct, and Criteri
