I-states-as-objects-analysis (ISOA) is a person-oriented methodology for studying short-term developmental stability and change in patterns of variable values. ISOA is based on longitudinal data with the same set of variables measured at all measurement occasions. A key concept is the "i-state," defined as a person's pattern of variable…

This article describes the development of a classification system to measure the expertise levels of practicing paediatric rehabilitation therapists. Seventy-five therapists from five disciplines (physical, occupational, speech-language, behaviour, and recreational therapy) were involved, along with 170 peers, and 188 parents of children with…