The What Works Clearinghouse (WWC) serves as a central and trusted source of scientific evidence for what works in education. The WWC designs its resources to help educators, administrators, families, researchers, and policymakers make evidence-based decisions. In fall 2023, the WWC convened the Small Working Group of Experienced Education…

The What Works Clearinghouse (WWC) is an investment of the U.S. Department of Education's Institute of Education Sciences. Its purpose is to provide educators, policymakers, researchers, and the public with a central and trusted source of scientific evidence on what works in education. The WWC's goal is to produce high-quality products that help…

Children who know fewer words in preschool typically continue to have lower levels of vocabulary knowledge in higher grades than their peers who know more words. In fact, this difference continues to be pronounced and even widens as these children reach higher grade levels. Interventions that support vocabulary development and reading…

Children who know fewer words in preschool typically continue to have lower levels of vocabulary knowledge in higher grades than their peers who know more words. In fact, this difference continues to be pronounced and even widens as these children reach higher grade levels. Interventions that support vocabulary development and reading…

Developing self-regulation at an early age is important for children's success in school and in life. Self-regulation involves the ability to remember instructions, shift attention from one thing to another, and reduce the intensity and frequency of impulsive emotions and behaviors. "Red Light, Purple Light" is a preschool program that…

Developing self-regulation at an early age is important for children's success in school and in life. Self-regulation involves the ability to remember instructions, shift attention from one thing to another, and reduce the intensity and frequency of impulsive emotions and behaviors. "Red Light, Purple Light" is a preschool program that…

The What Works Clearinghouse (WWC) Standards Briefs explain the rules the WWC uses to evaluate the quality of studies for practitioners, researchers, and policymakers. An aspect of a study is considered a confounding factor if it is not possible to tell whether the difference in outcomes is due to the intervention, the confounding factor, or both.…

"Pre-K Mathematics" is a supplemental mathematics program focusing on a range of mathematical concepts to help develop children's informal mathematical knowledge. The "Pre-K Mathematics" program includes teacher-led, small-group mathematics activities that are engaging and hands-on, as well as caregiver-child activities that…

"Head Start" is a national, federally funded program that provides services to promote school readiness for children from birth to age 5 from predominantly low-income families. Based on a review of the research, the WWC found "Head Start" to have potentially positive effects on general reading achievement and no discernible…

What Works Clearinghouse (WWC) quick reviews (QRs) are designed to provide education practitioners and policymakers with timely, preliminary objective assessments of the quality of the research evidence from recently released research papers and reports that have received coverage in the media. These reviews focus primarily on studies of the…

This paper presents an updated WWC (What Works Clearinghouse) Quick Review of the Report "Head Start Impact Study: Final Report". This study examined the effects of offering Head Start to 3- and 4-year-olds. Head Start is a federal program aimed at boosting the school readiness of low-income children by providing preschool education and…

The study examined the effects of the U.S. Department of Education's Student Mentoring Program (SMP) on students' interpersonal relationships, academic outcomes, and delinquent and risk behaviors. The study focused on approximately 2,600 at-risk fourth-through- eighth-grade students in 32 SMP sites. Applicants were randomly assigned to a program…

This study examined the effects of offering Head Start to preschoolers. Head Start is a federal program aimed at boosting the school readiness of low-income children by providing preschool education and health and nutrition services. The study analyzed data on about 4,700 preschool-aged children who applied for enrollment for the 2002-03 program…

"Let's Begin with the Letter People"[R] is an early education curriculum that uses 26 thematic units to develop children's language and early literacy skills. A major focus is phonological awareness, including rhyming, word play, alliteration, and segmentation. Children are encouraged to learn as individuals, in small groups, and in a…

"Job Corps," a federally funded education and job training program for economically disadvantaged youth, offers remedial education, GED (General Educational Development) preparation, vocational training, job placement assistance, and other supports. "Job Corps" participants typically reside in a "Job Corps" center…