The (English for Speakers of Other Languages) ESOL Development Unit provides a support service to CDETB centres in their provision of programmes which include students of migrant, refugee and asylum-seeking backgrounds. Based in the Curriculum Development Unit until 2015, it is now located in Captains road and is responsible for ESOL provision in the CDETB Adult education centres.
The CDU remains responsible for the CDETB English Language Support Service for Schools. Second Level ESOL support is provided to a small number CDETB mainstream schools following the Junior and Senior Certificate programme. The main activities of the unit fall under two broad strands: Teaching support and initial assessment.