Lack of linguistic skills poses as a major cause of underachievement for EMs.
Engelmann: language spoken by WC Black Americans is ungrammatical & disjointed.
Criticised for racism, labels black speech codes as inferior and white speech codes as superior.
Assumption that children that dont speak English at home may be disadvantaged educationally. But stats show that children whos first language isnt English are proven to do better at school. Being bi/tri-lingual can improve individuals executive functions