Since then many other stories were published and adapted into a new series (appropriately titled Little Princess), featuring issues such as sibling rivalry, bad manners and attachment.
The Big Bang Theory | Theory of a Deadman | music theory | probability theory | theory | Theory of relativity | theory of relativity | Social learning theory | Game Theory (band) | Game Theory | Conspiracy theory | Music theory | K-theory | AP Music Theory | Piaget's theory of cognitive development | conspiracy theory | Theory of Relativity | Theory | Terror management theory | Invariant theory | information theory | graph theory | Galois theory | Einstein–Cartan theory | Conspiracy Theory with Jesse Ventura | Chaos theory | Terror Management Theory | representation theory | Recapitulation theory | Probability theory |
The Neufeld approach (his attachment-based developmental model) is based on the attachment theory formulated by John Bowlby.