“…Toward the end of the 1960s and the beginning of the 1970s authors such as Anderson (1972, cited in Pilling 1973, Minde (1978;Minde et al, 1972), and Rutter (1967Rutter ( , 1977 began to study groups of physically handicapped children, the vast majority of whom had cerebral palsy, rather than doing case studies. They used objective methods of data collecting, including direct observation, interviews and questionnaires for teachers, parents, and subjects, and at least one investigator (Minde) has been engaged in a prospective longitudinal study.…”