To determine the personality characteristics that may be related to school readiness, particularly with reference to migrant preschool children, the following characteristics were examined: (1) delay of gratification, (2) relationship with achievement model, (3) dependency, (4) motor inhibition, (5) self control, (6) self concept, and (7) risk taking. The 195 children (187 black, 8 white) who participated in the study ranged in age from approximately 3 1/2 to 4 1/2 years, and were randomly selected from compensatory education programs for preschool children of migrant workers in Florida. In order to insure that the characteristics examined were of an affective nature, a cognitive ability measure was used as a covariate to remove achievement variance due to the child's cognitive ability. Tests used to determine the characteristics in question are explained in detail. Results indicated: (1) self concept accounted for a significant percentage of achievement variance for both boys and girls; (2) self concept, delay of gratification, and motor inhibition accounted for a significant percentage of variance for boys but not for girls; and (3) risk taking was related to school readiness for girls but not boys. It is suggested that future program planning take these sex differences into account. (Author/ED)