Understanding BICS and CALP

Variability Summary A

There are two major aspects of language proficiency that must be acquired by second language learners. Jim Cummins has identified these as Basic Interpersonal Communicative Skills (BICS), or conversational proficiency, and Cognitive Academic Language Proficiency (CALP), or academic proficiency. The chart below outlines the differences between BICS and CALP.

Characteristics of BICS: Conversational Proficiency

Characteristics of CALP: Academic Proficiency

The differences between these two kinds of language proficiency are evident in a comparison of a 6-year-old and a 12-year-old native English speaker. Large differences are found in their ability to read and write English and in the depth and breadth of their vocabulary knowledge (their academic proficiency), but little difference in their conversational proficiency. Second language learners can reach peer-appropriate conversational proficiency within two years, but it takes a minimum of five to seven years for them to acquire academic proficiency in English. This distinction is important in terms of providing sufficient support for second language learners.


Cummins, J. (2000). Language, power, and pedagogy: Bilingual children in the crossfire. Clevedon, UK: Multilingual Matters.

Adapted with permission from:                                                                                             

Teemant, A. & Pinnegar, S. (2007). Understanding Langauge Acquisition Instructional Guide. Brigham Young University-Public School Partnership. 

Suggested Citation

& (2019). Understanding BICS and CALP: Variability Summary A. In (Ed.), Principles of Language Acquisition. EdTech Books. https://edtechbooks.org/language_acquisition/variability_summary_a