Demand, Supply, and Shortage of Bilingual and ESL Teachers: Models, Data, and Policy Issues. Boe, Erling E. A comprehensive teacher demand, supply, and shortage (TDSS) model is proposed as a conceptual framework for analyzing and determining the teaching force in bilingual and English-as-a-Second-Language (ESL) education. Available data on the shortage of bilingual education teachers are reviewed, and new national data on their characteristics are presented. Information needs and policy issues are discussed with respect to TDSS in bilingual education. It is suggested that there is a need to consider alternative means to increase the supply of ESL and bilingual teachers in order to improve the retention of qualified experienced teachers and to improve the yield and retention of newly graduated teachers. in Administrators > Recruit and Retain Bilingual and ESL teacherswith bilingualmodelrecruitretaintdssteachers