This thematic overview presents some studies on the validation and verification of Perspective Text Analysis (PTA). The first section, containing the validation part, provides evidence for the hypothesis about the capacity of PTA to reflect specificity of ecologically specified observations in text production. The following section presents verification studies within various contexts and focuses on individual prerequisites and constraints that are at work when a person is put in a situation in which he/she is required to act adequately. These studies are divided into five main parts. The first is concentrated to clinical situations, the second to learning environments, the third to business organisations, the fourth to ideological contexts, and the fifth to the area of consumption. Finally, two sections present some experimental studies on instruction, which gives reasons for the construction of materials on evolutionary grounds. Founded on these materials, results from a longitudinal experiment concerning two individuals’ development and growth in schooling situations are presented and discussed.