These ideas were developed by a man of Jim Cummins.
BICS: Basic Interpersonal Communication Skills - the basic langauge ability required for face-to face
communication (context embedded) These skills can be gained in only 1 to 2 years.
CALP: Cognitive Academic Language Proficiency - the language required for academic acheivement (context
reduced) For these skills you need an additional 3 to 5 years of time. That is as total of 5 to 8 years
of language study.