The purpose of this study was to determine the relationships among the Nursing Child Assessment Teaching Scale (NCATS), the Home Observation for Measurement of the Environment (HOME) inventory, and interactive behaviors observed in the home for fifty-three 3-year-old, prematurely born children and their mothers. The total HOME score showed high internal consistency, with moderate subscale levels. NCATS total score showed high internal consistency, but low to moderate subscale consistency. Combining NCATS subscales into a mother subscale and child subscale improved internal consistency. The HOME and the NCATS mother subscale correlated with observed maternal behaviors, but the NCATS child subscale was unrelated to child behaviors. Relationships between observed behaviors and HOME scores did not differ for high- and low-education mothers or for Caucasians and African Americans, but only low-education mothers and African Americans exhibited correlations between NCATS scores and observed behaviors. These results show the HOME, NCATS, and naturalistic observations measure related, but not overlapping, aspects of the mother's contribution to her relationship with her child, but the NCATS child subscale should be used with caution with 3-year-olds.