This report examines the theoretical result of a change in the way Oklahoma could fund its common schools if it used a Texas tax system that relied heavily on an ad valorum tax structure or another taxation system. Using data from the 1999 school year, calculations of state aid for the more than 540 school districts were made for four scenarios: Oklahoma tax system without recapture, Oklahoma tax system with recapture, Texas system without recapture, and Texas system with recapture. Calculations were compared with one another of these scenarios for the 1999 school year. Results indicate that if there is a shift from state collection and dispersal of tax dollars for Oklahoma's common schools, a recapture mechanism could be used to maintain the level of fiscal neutrality that Oklahoma has enjoyed for the past several years. Recommendations include keeping the bulk of tax collections for schools at least at the present level of 60 percent from state sources, and examining how other tax structures would affect school funding. Attachment A shows student (statistical) weights used in calculations; Attachment B is a copy of the State Aid Formula used to calculate foundation and incentive aid for 1998-99. (Contains 23 references.) (RT)