The basic facts of this cause are not in dispute. [FN1] The only question is whether those facts describe a public school financing system that meets the requirements of the Constitution. As summarized and excerpted, the facts are as follows. FN1. By agreement of the parties, the 1985-86 school year was used as the test year for purposes of constitutional review. There are approximately three million public school children in Texas. The legislature finances the education of these children through a combination of revenues supplied by the state itself and revenues supplied by local school districts which are governmental subdivisions of the state. Of total education costs, the state provides about forty-two percent, school districts provide about fifty percent, andthe remainder comes from various other sources including federal funds. School districts derive revenues from local ad valorem property taxes, and the state raises funds from a variety of sources including the sales tax and various severance and excise taxes. There are glaring disparities in the abilities of the various school districts to raise revenues from property taxes because taxable property wealth varies greatly from district to district. The wealthiest district has over $14,000,000 of property wealth per student, while the poorest has approximately $20,000; this disparity reflects a 700 to 1 ratio. The 300,000 students in the lowest-wealth schools have less than 3% of the state's property wealth to support their education while the 300,000 students in the highest- wealth schools have over 25% of the state's property wealth; thus the 300,000 students in the wealthiest districts have more than eight times the property value to support their education as the 300,000 students in the poorest districts. The average property wealth in the 100 wealthiest districts is more than twenty times greater than the average property wealth in the 100 poorest districts. Edgewood I.S.D. has $38,854 in property wealth per student; Alamo Heights I.S.D., in the same county, has $570,109 in property wealth per student. The state has tried for many years to lessen the disparities through various efforts to supplement the poorer districts. Through the Foundation School Program, the state currently attempts to ensure that each district has sufficient funds to provide its students with at least a basic education. See Tex.Educ.Code § 16.002. Under this program, state aid is distributed to the various districts according to a complex formula such that property-poor districts receive more state aid than do property-rich districts. However, the Foundation School Program does not cover even the cost of meeting the state-mandated minimum requirements. Most importantly, there are no Foundation School Program allotments for school facilities or for debt service. The basic allotment and the transportation allotment understate actual costs, and the career ladder salary supplement for teachers is underfunded. For these reasons and more, almost all school districts spend additional local funds. Low-wealth districts use a significantly greater proportion of their local funds to pay the debt service on construction bonds while high-wealth districts are able to use their funds to pay for a wide array of enrichment programs.