Goldilocks principle

The Goldilocks principle is named by analogy to the children's story The Three Bears, in which a little girl named Goldilocks tastes three different bowls of porridge and finds that she prefers porridge that is neither too hot nor too cold, but has just the right temperature. Since the children's story is well known across cultures, the concept of 'just the right amount' is easily understood and applied to a wide range of disciplines, including developmental psychology, biology, astronomy, economics, and engineering.