"I was always looking for products and programs that I felt good about and that would entertain my young son and hold his attention, because very few things would hold his attention. ... I started noticing what worked with him and what didn’t – the characters, music, pacing and so on — and I came up with a formula in my mind of what was needed in order to work with preschoolers."
January 1, 1970
https://en.wikiquote.org/wiki/Barney_%26_Friends