I'm sharing this post because it contained a letter from a writer on Sesame Street. Favorite bit:
The folks in Research all have Master's degrees and PhD's in education, child psychology, etc. Research will review each script and give their comments to our head writer. . . .I always knew Sesame Street had sound educational principles behind the Letter of the Day and Feist singing the "1, 2, 3, 4" song with penguins, but I had no idea they had such high requirements from their staff. I knew I liked those muppets for a reason.