 Shortly after beginning Sesame Street , its creators developed the " CTW model " : a system of planning , production , and evaluation which only emerged after the show 's first season . The CTW model involved the interaction between television producers and educators , the development of a curriculum for three- to five @-@ year @-@ old children , formative research to shape the program , and independent summative research into what viewers learned . According to Cooney , " Without research , there would be no Sesame Street . " 
