 When educational experts and producers in other countries approached CTW for assistance in producing their own versions of Sesame Street , which became known as " co @-@ productions " , a variant of the CTW model was used . The need for preschool education in each country was assessed through research and interviews with television producers , researchers , and educational experts , similar to the process followed in the US . The producers then convened a series of meetings with the experts , held in the individual countries , to create and develop a curriculum , the program 's educational goals , its set , and its characters . They held meetings , at the CTW offices in New York City and in the respective country , to train the co @-@ production team in the CTW model . Each co @-@ production conducted formative studies before production and if possible , summative studies to test the efficacy of its curriculum . 
