The practice of individual assessment has been moving toward the empirically derived Cattell-Horn-Carroll (CHC) theory of intellectual ability, which offers a hierarchical taxonomy of cognitive abilities. Current assessment tools provide varying adherence to operationalizing CHC theory, making clinical inference difficult. Expert consensus…

Data collection can be the most time- and cost-intensive part of developmental research. This article describes some long-proposed but little-used research designs that have the potential to maximize data quality (reliability and validity) while minimizing research cost. In "planned missing data designs", missing data are used…

Believes extra attention must be focused on language and cultural differences in preparing Individualized Educational Programs. Reports observations from working with Spanish speaking exceptional children in Costa Rica. Describes pilot study conducted to attempt to discover problems associated with administration of Wechsler Intelligence Scale for…