In the Mesa, Arizona, public schools, 4-year-old children with birthdays during the period from September to December were allowed to enter kindergarten if they passed the district screening test. Kindergarten teachers disagreed with this policy and recommended that, with no exceptions, the district no longer enroll 4-year-old children. Subsequently, a survey was sent to all kindergarten teachers in the district in order to solicit their opinions regarding kindergarten entrance requirements. It was found that 90 percent of the teachers believed that children should be allowed to enter kindergarten only if they were 5 years of age by September 1. In addition, a large percentage of the teachers believed that chronological age was the best criterion for determining a child's readiness. Over 40 percent of the teachers indicated they would support entrance of a 4-year-old child if that child passed a developmental readiness test. Since teachers recommended fewer 4.5-year-olds than 5- to 5.5-year-olds be retained in kindergarten, the survey data did suggest that age should not be the sole criterion for kindergarten entrance. Data further suggest that the social and emotional maturity of the youngest children are relevant admission criteria. Findings indicate that in all three age groups more boys than girls were recommended for kindergarten retention; these sex differences reached statistical significance in the 5- to 5.5-year-old age group only. (RH)