I'm a little confused about the difference between P&P and GB.
This Wikipedia article suggests that they are the same as grammar frameworks, from what I understood:
Principles and parameters as a grammar framework is also known as government and binding theory. That is, the two terms principles and parameters and government and binding refer to the same school in the generative tradition of phrase structure grammars (as opposed to dependency grammars).
What does it mean that they are the same as grammar framework? What are the actual differences between them?
This Wikipedia article has the following hierarchy, which suggests that GB is a particular case of P&P. (And MP is a particular case of P&P.)
At least that's how I interpret this hierarchy. If this is true, in what sense is GB a particular case of P&P?