Duel Iceberg Hypothesis in Second Language Acquisition | TESL Explained #73678 (License: Personal Use)

This diagram depicts Cummins’ (1981) Duel Iceberg Hypothesis, where two icebergs represent first (L1) and second (L2) language proficiencies emerging above a shared underwater base labeled “Common Underlying Proficiency.” The visual emphasizes that linguistic skills are not isolated but interconnected through cognitive and metalinguistic resources. The orange wavy line symbolizes the surface of awareness or observable language use.

Used in ESL/EFL teacher training, academic presentations, and curriculum design to explain cross-linguistic transfer and support for bilingual learners; matches user intent seeking theoretical models of language acquisition.