Examined relationships among child-mother attachment when children were age 3; family stress when children were 3, 4, and 5; and social-emotional outcomes in kindergarten. Found that less secure kindergartners were more aggressive and less socially competent than secure peers, and kindergartners who had experienced more family stress in preschool years were more aggressive and less socially competent than peers experiencing less stress. Boys were more aggressive and anxious than girls. (Author/KB)