Papers from three annual conferences of the Research Council for Diagnostic and Prescriptive Mathematics are presented. They are: "The Mathematics Clinic Model: Parents as Clinicians and their Effect on Achievement, Attitude, and Self-Concept" (Lee Wise and Janet Scheer); "Heterogeneous versus Homogeneous Item Arrangements in Mathematics Testing" (John Engelhardt, Linda Oldaker, and Leonard Cahen); "Testing Mathematical Problem Solving" (Thomas Romberg, Kevin Collis, and Mirad Jurdak); "A Model and Sequence for Diagnostic Instruction in Problem Solving" (Francis Fennell); "The Validation of a Criterion-Referenced Test of Rational Number Concepts and Skills" (Barbara Sadowski); "An Exploration: White and Clark's Test of Inclusion Applied to Ex Post Facto Learning Data" (Bob Underhill); "Brain Hemispheric Considerations for a Developmental Appproach to Diagnosing Mathematics Concepts for Children" (Janice Flake); "Doing it Their Way: Some Child-Methods in Mathematics" (Lesley Booth and Kathleen Hart); "Diagnostic and Prescriptive Instruction Applied to Teaching Mathematically Talented Students" (Kevin Bartkovich); "Linguistic Aspects of More/Less and Dimensional Adjectives Relevant to Diagnosis and Instruction" (Carol Novillis Larson); "Improving Computation--A look at Estimation and Approximation as Significant Elements in Achieving Understanding and Correctness" (Douglas Crawford); and "Strategies for Diagnosing and Enhancing Learning of Place-Value Concepts" (Bob Underhill). (JN)