Every year since recruitment to the study (beginning at child age 2) a visit was made to the home, and each family was assessed using a variety of questionnaires, interviews, assessor impressions, and videotaped observations. All the measures used in this study were executed at the home visit. Responses to the measures described in the following subsections were assessed at the age 2 home visit and were used in the analyses to help predict class membership in the intervention or the control group.
