Developmental data on 612 home reared, Down's Syndrome children, from birth through 16 years of age, were collected over 20 years from an outpatient clinic for mentally retarded children and were statistically analyzed to ascertain normative times of motor, language and intellectual developmental behaviors. (Author/MC)

This is the first half of a dissertation about a method of predicting the learning time required for tasks consisting of manual skills and is mainly concerned with the fields of production, production planning, and operator training. The article will be continued in the December issue. (Author/MS)

These data appear to support the conception that the speech motor system can act as a mediator of other motor systems when speech'' is experimentally manipulated. (Author)

From a symposium on Cross-Cultural Studies of Mother-Infant Interaction at the Biennial Meeting for Research in Child Development, Minneapolis, Minn., April 2, 1971. (MB)

Describes the five basic stages of motor development as activities in a perceptual motor program for children of normal intelligence who have learning problems. The program emphasizes the relation between sound motor development and academic achievement. (Author)

The underlying structure of the motor abilities represented by the "Short Form of the Bruininks-Oseretsky Test of Motor Proficiency," along with the consistency of the emerging factors by sex and two chronological age (CA) levels, were studied with 765 nondisabled children 4.6 to 14.6 years old. (Author/SEW)