¹ This report has been updated to include reviews of three studies that were released since 2007, a review of one study that was released in 2005 but was not reviewed for the previous report, and a re-review of two studies that were included in the previous report. Of the six studies, one met evidence standards, one met evidence standards with reservations, one was not within the scope of the protocol, and three were within the scope of the protocol but did not meet evidence standards. A complete list and disposition of all studies reviewed is provided in the references. The findings described in the previous Doors to Discovery™ intervention report were based on a study by Assel et al. (2007). A re-review of that study for the present report revealed that the subcluster attrition rate of children exceeded standards, as specified in the Early Childhood Education protocol. Hence, results from the Assel et al. (2007) study were not considered when preparing the present intervention report.
² The descriptive information for this program was obtained from publicly available sources: the program’s website (https://www.wrightgroup.com/
family.html?PHPSESSID=ae71226df93c0a0211ac7a57f5d22c66&gid=183&longCopy=Y, downloaded November 5, 2008) and the research literature (Assel et al., 2007; PCER Consortium, 2008). The WWC requests developers to review the program description sections for accuracy from their perspective. Further verification of the accuracy of the descriptive information for this program is beyond the scope of this review.
³ The studies in this report were reviewed using WWC Evidence Standards, Version 1.0 (see the WWC Standards).
⁴ The evidence presented in this report is based on available research. Findings and conclusions may change as new research becomes available.
⁵ These numbers show the average and range of student-level improvement indices for all findings across the studies.