Since 1971, most states have been subject to lawsuits seeking to refor
m their education funding systems. These cases are litigated on the ba
sis of state (not federal) constitutional language and generally seek
either greater equity in funding among school districts or a guarantee
d level of adequate funding for education. State supreme courts have f
ound the finance systems unconstitutional in 16 states, and many state
s are still actively involved in litigation. Even where litigation has
not occurred or has not succeeded, the prospect of litigation has pro
mpted revisions of state funding policies. Despite the predominant rol
e equity and adequacy play in litigation, there are no universally acc
epted definitions for either of these words in education funding. Most
commonly, equity is measured in terms of the variation in per-pupil r
evenues among school districts in a single state. By this measure, som
e states have greater funding equity than others, and in most states w
ealthy districts have significantly higher per-pupil expenditures than
do poor districts. Equity is likely to be greater when the residents
of poor districts pay higher taxes. (In some states, residents in poor
er areas pay twice as much of their income in local taxes as do reside
nts of wealthier communities.) Equity is also greater in those states
where the state's share of the education budget is higher and where th
e state consistently targets its contributions to lower-income distric
ts. Much of current litigation and legislative activity in education f
unding seeks to assure ''adequacy,'' that is, a sufficient level of fu
nding to deliver an adequate education to every student in the state.
Most states have not explicitly addressed the questions of how much ed
ucation is ''adequate'' or how educational standards can be converted
to a finance formula. Several approaches to calculating the cost of an
adequate education are described.