A review of the literature was made of the various procedures for sequencing instructional units in individualized instruction programs. Procedures for validating sequences of instructional units, or learning hierarchies, were found to fall into two general categories. One category included procedures based on coefficients of dependence, while the…

Evidence is offered that children with specific language impairment often have serial memory difficulties. Research on the difficulties such children have in rote counting and in learning nursery rhymes is reviewed. Implications of current research for assessment and intervention in mathematics and rhymes are discussed. (DB)