Mandatory Declassification Review is a provision of E.O. 13526 that allows members of the public to request a classification review of a classified document in order to obtain a releasable version of that document. The document must be classified in order to qualify for MDR; otherwise, the request must be made under the FOIA. The desired document must be specified in sufficient detail that it can be readily located. If documents pertaining to a particular subject are desired, that request should be made under the FOIA. There are some limitations to MDR, including: a minimum two-year limit between classification reviews (i. e., no MDR review need be conducted if the record was reviewed less than two years previously); a one-year time frame in which to accomplish the review (cf. FOIA's 20-day initial and follow-on responses to requesters); the record in question may not be the subject of litigation (e. g., before a court due to another requester's FOIA appeal). One prominent advantage of the MDR process is the availability of the ISCAP for appeals, cf. the (expensive) legal recourse for FOIA appeals.