Multilingual competence rests on three stages: acquisition, assessment and application.
Acquisition separates three terms often treated as synonyms: mother tongue (the language of those closest from birth), native language (the language of the environment lived in from an early age), and first language (the one used most and strongest where several are spoken). Conversational fluency does not mean a language can be used professionally, so native-speaker status alone often will not deliver excellent production.
Assessment covers two grading systems. CEFR runs across six levels from Basic to Proficient; the ILR scale runs across 11 levels from no functional ability to functionally native, tested across speaking, listening, reading and writing. A high level does not make someone a translator, interpreter, or performance linguistics analyst, each of which needs its own skills such as perfection, analytical speed, or an understanding of marketing KPIs. Fluency is better qualified with adjectives, and listening must match speaking ability.
Application places listening first, with regular small daily practice over occasional long sessions and harder material introduced as proficiency grows. Switching between similar languages can cause subconscious merging, so capturing the feeling of a language before switching helps.
Ultimately, professional multilingual competence is not static, but a lifelong exercise requiring continuous maintenance and self-discipline.
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