And how do you make the correspondence to other education systems, like for instance, European Latin countries? This now will change with the Bologne process that will uniform the duration of the university degrees and respective nomenclature.
Either way, in my case, my degree was a 5 years and if you don't complete it all, you wouldn't have any diploma (meaning, if you complete 3 years you get a BSc and then the additional 2 years would award you a MSc. This option was not available or you do 5 years or you don't). I believe that the closest that this gets to the UK/US system is a MSc/MS. In my country (in old times) for you to have a "Master" you would need to enroll in an additional 2 years. There was a funny thing that some colleagues after finishing their degree would go to UK for a MSc. Then they would realize that that was equivalent to our 4th/5th year of university.