Elementary proficiency is the first level in the scale. This level is sometimes referred to as S-1 or Level 1. A person at this level is described as follows:
Limited working proficiency is the second level in the scale. This level is sometimes referred to as S-2 or level 2. A person at this level is described as follows:
Professional working proficiency is the third level in the scale. This level is sometimes referred to as S-3 or Level 3. S-3 is what is usually used to measure how many people in the world know a given language. A person at this level is described as follows:
Full professional proficiency is the fourth level in the scale. This level is sometimes referred to as S-4 or level 4. A person at this level is described as follows:
Native or bilingual proficiency is the fifth level in the scale. This level is sometimes referred to as S-5 or level 5. A person at this level is described as follows:
Foreign Service Level 1 - Elementary proficiency
Foreign Service Level 2 - Limited working proficiency
Foreign Service Level 3 - Professional working proficiency
Foreign Service Level 4 - Full professional proficiency
Foreign Service Level 5 - Native or bilingual proficiency
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