CALP development usually takes how long?

Cognitive Academic Language Proficiency (CALP) refers to the proficiency in the academic language necessary for success in a school environment. It usually takes about 5 to 7 years for English Language Learners to develop CALP to a level comparable to native speakers. This timeframe is influenced by various factors, including the learner's age, linguistic background, the amount of exposure to the language, and the educational context.

CALP involves the ability to understand and manipulate complex language structures and vocabulary that are often found in academic settings. This is distinct from Basic Interpersonal Communicative Skills (BICS), which typically takes less time to acquire, as it focuses on everyday conversational language. Understanding the extended period needed for CALP development is crucial for educators in designing appropriate curricula and supports for English Language Learners.