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…

The process of adapting the Wechsler Intelligence Scale for Children-Revised (WISC-R) for Puerto Rico was begun with the following objectives: (1) to review the existing Spanish translation of the WISC-R; (2) to adapt the WISC-R to Puerto Rican culture and milieu; and (3) to standardize the scale with a representative sample of Puerto Rican…