To submit an evaluation for consideration, email email@example.com.
General Eligibility Criteria for Child Trends’ What Works Analyses
Since the purpose of What Works is to compile a database of social interventions for children, we have attempted to be as inclusive as possible. In selecting programs for this database, we have used the following criteria:
- Only social interventions (that is, not medical) are included.
- Every study has a treatment group and a control group, and random assignment (that is, a lottery system) was used to determine placement of participants into treatment and control groups.
- Only results based on an intent-to-treat analysis are reported.
- Studies were conducted around the world, but all reports are in English.
- Studies are included if they have a response rate as low as 50 percent, but evaluations with low response rates and other major methodological limitations are noted.
- Results meeting the .05 level of significance were reported.
- Classroom-based programs are included if they:
- utilize teaching methods appropriate for out-of-school-time programs (e.g., educational television programming or computer software);
- are conducted with preschool children in daycare or in other preschool programs;
- involve volunteer tutors; or
- are held during the summer months, when school is not in session.
- No restrictions were made on sample size.
- No statistical re-analyses have been done to adjust or revise the results presented by the studies’ authors.
Special Eligibility Criteria for Analysis
Out-of-School Time Program Evaluation Criteria
- Subjects are assigned to treatment and control groups through random assignment and are not re-assigned.
- Results are based on intent-to-treat analyses including data for all subjects who were randomly assigned in the analysis, regardless of their participation in the study)
- Interventions must be non-biomedical.
- Classroom-based curriculum interventions are only included if they include methods appropriate for out-of-school-time programs, preschool children, or volunteer tutors/mentors, or are held while school is not in session.
- Response rate must be at least 50 percent at post-test.