The Programme for International Assessment of Adult Competencies (PIAAC) will establish technical standards and guidelines to ensure that the survey design and implementation processes of PIAAC yield high-quality and internationally comparable data. This document provides a revised version of the technical standards and guidelines originally…

Factors that influence the sample size necessary for longitudinal evaluations include the nature of the evaluation questions, nature of available comparison groups, consistency of the treatment in different sites, effect size, attrition rate, significance level for statistical tests, and statistical power. (Author/GDC)

This report is one of five submitted as products of a "Study Designed to Assist Planning of Research on Significant Instructional Features in Bilingual Education Programs." The reports are intended to assist the National Institute of Education (NIE) in its plans for a major new research study in bilingual education. The present report…

Evaluations involving nonrandom assignment to treatment or control groups are vulnerable to an accidental or intentional confounding of a selection effect with the treatment effect. Two techniques, discriminant analysis and base expectancy analysis, permit separate estimation of the selection and treatment effects in the final results. (Author/CTM)

The purpose of scientifically-based research within No Child Left Behind (NCLB) is to identify and disseminate conclusive information on ?what works? in education, with an emphasis on determining what instructional input (curricula, instructional techniques) works to increase student outcomes such as academic achievement and language proficiency.…

This report presents the analytic plan for a study of demonstration Title I projects. The study is to be one of distributional equity: what kinds of instructional services are received by what kinds of students. It is mandated by the United States Congress and will provide the basic analysis for possible modifications in the Elementary and…