It's laughable that Greek government wants to hold a referendum for this. Weren't they elected specifically to negotiate terms?
To be fair to them, it's probably not that easy. I imagine the negotiations have been something like this:
Eurozone finance ministers and the IMF:
"fire nearly all of your public workforce, cut wages and take a scythe to pensions. Make regular payments that will hinder your recovery and growth. There's no evidence that this will actually help you, but do it anyway. For the next few decades, said payments will keep you chained to such policy, indebted to us, and your people poorer - but its got to be done old boy, we're doing a good job of painting you like a nation of feckless irresponsible cretins. Your children and their children might even still be paying us when you're in the grave."
Greek government:
"Can we reach a reasonable compromise? We were elected on a platform of negotiating a better deal for ordinary Greeks. We already have 20% unemployment. We're being pretty honest here, we can't make the scheduled payments and would like to find a way out of this, obviously"
Eurozone finance ministers and the IMF:
"Fire what's left of your public workforce, cut wages and take a scythe to pensions."
but with more squabbling over economic minutae obviously. All this talk of Plan B and Plan A, I'm not sure the Euro finance ministers were ever doing anything other than buying time to insulate themselves. I don't believe they've had the best interests of Greece at heart at all.