Namnezia has initiated an interesting conversation on the criteria for awarding a PhD in the sciences. A commenter over there alleged a set of rules that is nearly impossible for me to believe is true. RX claims:
No official requirements for my PhD program, it's up to the PI.
My lab is crazy. Here's the requirement: total first author impact factor: 30, total pages of paper: 20. The first graduate of my lab got 1 Neuron and 1 Nature Neuroscience paper. All the rest graduates tend to follow this pattern.
This is one reason it shouldn't be left up to the PI, there is a reason doctoral committees and doctoral program rules exist.