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What is full professional proficiency?



Full professional proficiency is the fourth level of five in the Interagency Language Roundtable (ILR) scale of language proficiency, formerly called the Foreign Service Institute (FSI) scale. This level is sometimes referred to as S-4 or level 4. A person at this level is described as follows:

  • able to use the language fluently and accurately on all levels normally pertinent to professional needs
  • can understand and participate in any conversations within the range of own personal and professional experience with a high degree of fluency and precision of vocabulary
  • would rarely be taken for a native speaker, but can respond appropriately even in unfamiliar situations
  • makes only quite rare and unpatterned errors of pronunciation and grammar
  • can handle informal interpreting from and into the language.

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Go to SIL home page This page is an extract from the LinguaLinks Library, Version 3.5, published on CD-ROM by SIL International, 1999. [Ordering information.]

Page content last modified: 15 July 1998

© 1999 SIL International