A new report published by the Manhattan Institute for Education Policy, "The Effect of Special Education Vouchers on Public School Achievement: Evidence from Florida's McKay Scholarship Program," attempts to examine the complex issue of how competition introduced through school vouchers affects student outcomes in public schools. The possible contributions of this report, however, are outweighed by research design problems, failure to take into account alternative explanations, and unsubstantiated assumptions about the direction of possible selection bias. Together, these problems call into question the findings and render the conclusions drawn from those findings highly suspect. (Contains a list of 13 notes and references.) [This paper reviews the following document: "The Effect of Special-Education Vouchers on Public School Achievement: Evidence from Florida's McKay Scholarship Program. Civic Report No. 52" (ED501690).]