Since 30 September 1990, students graduating from DLIFLC programs have been certified according to their global proficiency in the target language, as demonstrated by their performance on the Defense Language Proficiency Test (DLPT). This applies to graduates of resident foreign language education at the DLIFLC, Presidio of Monterey, and to graduates of educational programs administered under contract by the DLI Washington Office. Only test results from a DLPT administered at the DLIFLC or by the DLI Washington Office, as end-of-program proficiency evaluations, are used to determine eligibility for Linguist Certificates. Results must be available for all three skills—listening, reading, and speaking—for a Linguist Certificate to be awarded. There are four certificates: Novice Linguist, Basic Linguist, Intermediate Linguist, and Advanced Linguist. Each level of certification reflects specified minimum proficiency levels in the three skills (see DLIFLC Regulation 350-1).