Demographic, personality-attitudinal, and interpersonal measures were examined to determine which measures best predicted the couple's present family size and projected family size (present size plus additional children desired) for both the wife and the husband. Subjects were 35 Caucasian, middle class, Protestant couples in Knoxville, Tennessee. Results of the regression analyses predicted 70% of the variance in present family size, 83% of the variance in the husband's projected size, and 98% of the variance in the wife's projected size. Actual or present family size was best predicted by demographic measures such as the wife's age at marriage and number of years married. The husband's projected family size was best predicted by demographic measures such as the couple's success at birth planning and the wife's educational level, but the husband's possibly unfulfilled need to give and receive high amounts of affection also was important. The wife's projected family size was best predicted by personality-attitudinal and interpersonal variables such as her need to have children to confirm her identity, her high anxiety level relative to her husband, and her desire to give a lot of affection, which in many cases does not seem to satisfy her husband's high affectional need. (Author)