The part that led to 25% drop in GDP and three times the unemployment rate. The part that took a 50bn problem and made it 330. You can say whatever you want about the incompetence of Greek governments, but the wise foreign advisors managed to be even worse in every respect (e.g. using wrong multipliers to calculate impact of reforms and even making growth assumptions in an economy they themselves dried up from investment.)

There is an additional reason that makes the 'Cadastre' extremly difficult project for Greece. A lot of the land in northern Greece is claimed (with documents) by people who are now citizens of Republic of Macedonia. Greece will break some EU laws if it doesn't honor those documents, but that land is used for more than 60 years by other people or the Greek state.

Ah, unwillingness to return stolen property to the righteous owners is a valid excuse?