This article describes a replication of the "First Step to Success" program (Walker, Stiller, Severson, & Golly, 1998) with at-risk students in the first and second grade to determine program effectiveness in decreasing inappropriate behaviors and increasing academic engagement time. This expands the "First Step to Success" program to (1) serve slightly older students than those in the earlier kindergarten studies; (2) assess implementation effects across a full school day rather than half-day periods; and (3) determine effects when used in conjunction with individualized, across-the-day, contingency reinforcement systems. A multiple-baseline design was used to study the effects of the "First Step to Success" early intervention program. Three students and their parent(s) and teachers participated in the study. Direct observation measures showed dramatic improvements in academic engagement time and decreases in disruptive behavior. Findings across students indicated that intensive behavioral interventions increased positive outcomes for students who are at risk for emotional and behavioral disorders (EBD). (Contains 4 tables and 2 figures.)