In educational research and evaluation, a sample of subjects usually received some type of programmatic treatment. Outcome scores for these students are then compared with outcome scores of a control or comparison group. M. Lewis and H. McGurk (1972) have pointed out that there are some implicit assumptions when this approach is applied to…

With the enactment of the "Education for All Handicapped Children Act" of 1975, all children are entitled to appropriate free education and related services regardless of disabilities. As a result, major strides have been made toward providing services for developmentally delayed children. To gain access to these services, children who…

The "Education for All Handicapped Children Act" (1975) requires that all children with disabilities receive a free and appropriate public education. Determining who has a disability and who is eligible for special services, however, is not an exact science. While practices differ greatly both across and within states, screening is an…