The evidence base for Twelve Together is a single randomized controlled trial that met WWC standards only with reservations due to differential attrition¶
Claim · All claims
Evidence · 1 study · reviewr?·q3
Currency · newest study 2007 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? One study (Dynarski, Gleason, Rangarajan, & Wood, 1998), a randomized controlled trial with 219 students, met WWC evidence standards with reservations because of differential attrition between the intervention and control groups; a second study did not meet WWC evidence screens. → What Works Clearinghouse 2007
Evidence¶
What Works Clearinghouse 2007¶
What Works Clearinghouse, U.S. Department of Education. (2007). WWC Intervention Report: Twelve Together. https://ies.ed.gov/ncee/wwc
q3 · i? · review · r?
The WWC reviewed two studies of Twelve Together. The Dynarski et al. (1998) RCT met standards with reservations; survey response rates were 92% for the intervention group and 86% for the control, exceeding the 5% differential attrition threshold. The other study (Orr, 1987) failed screens for baseline equivalence.
"One study (Dynarski, Gleason, Rangarajan, & Wood, 1998) was a randomized controlled trial that met WWC evidence- standards with reservations because of differential attrition between the intervention and control groups."
Discussion¶
Related Claims¶
- The supporting evidence for FLIGHT comes from a single randomized controlled trial with compromised random assignment — related
- The evidence base for first year experience courses consists only of quasi-experimental studies meeting WWC group design standards with reservations — related
- Twelve Together has potentially positive effects on staying in school, based on a lower (non-significant) dropout rate than control — related
- Twelve Together shows no discernible effects on progressing in school as measured by highest grade completed — related
- The WWC improvement index for Twelve Together is +13 percentile points for staying in school and –6 percentile points for progressing in school — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
twelve-together-single-rct-attrition-reservations |
title |
The evidence base for Twelve Together is a single randomized controlled trial that met WWC standards only with reservations due to differential attrition |
description |
The evidence base for Twelve Together is a single randomized controlled trial that met WWC standards only with reservations due to differential attrition |
status |
review |
evidence_strength |
weak |
newest_evidence |
2007 |
generated |
by process:wiki-ingest on 2026-10-09 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — what-works-clearinghouse-2007 |
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