Child care quality depends on child care regulation as plants depend on wat
er. An insufficient amount guarantees problems, but an excessive amount may
also be problematic. The principal responsibility for child care regulatio
n in the United States resides with state government officials, who must re
gulate a highly diverse industry. Research shows that regulation promotes q
uality but that trade-offs exist. Quality improvements that undermine avail
ability or affordability should be evaluated with care. Also, regulatory en
forcement deserves as much attention as regulatory standard setting. To imp
rove child care regulation, state policymakers should consider eliminating
some local regulations, regulating more family day care homes, upgrading te
acher-training requirements, allocating more resources to regulatory enforc
ement, and designing more effective enforcement strategies.