Common Underlying Proficiency BICS from our CALP According to please see this website for the basics of CUP subtractive "Second language acquisition - essential information" Second language acquisition – essential information bilingüismo sustractivo Second language acquisition - essential information BICS from our CALP BICS from our CALP James Cummin's & CUP BICS from our CALP Jim Cummins asserts "Second language acquisition - essential information" BICS from our CALP subtractive bilingualism work of Professor Jim Cummins