Shortly after the premiere of Sesame Street, the CTW was approached by producers, educators, and officials in other nations, requesting that a version of the show be aired in their countries. Former CBS executive Mike Dann left commercial television to become vice-president of the CTW and Cooney's assistant;[note 17] Dann began what Charlotte Cole, vice president for the CTW's International Research department, called the "globalization" of Sesame Street.[115] A flexible model was developed, based upon the experiences of the creators and producers of the original show. The shows came to be called "co-productions", and they contained original sets, characters, and curriculum goals.