Originally Posted by creak
The marking is internal, but double or triple marked by different tutors, and a grade agreed between them. A sample of the papers/essays are then sent, after being awarded a grade internally, to other universities for external marking, to make sure standards are being maintained and that appropriate grades are awarded for equivalent work across all institutions.
Yup - that's probably the best way of describing how it's done. It happens at every university for every subject and especially in the third year.
Originally Posted by plibbers
If the marking is internal (or even perhaps if it is external) does this mean that it is easier to get firsts and seconds at certain universities than it is in others even in the same subject due to varying standards?
The above aka external moderation sees to it that this hopefully doesn't happen. Externals can come from any other university, the top names don't stick together for example. If you look at Oxford's examiner reports for History (they're online), you'll see that externals come from Hull, Notts and Essex. Cambridge got pulled up one year for marking too harshly so it can be highlighted.
Actual marks wise - it all depends on the subject for a start as some are just so subjective. There's no right or wrong answer in History or English for example. Regarding actual degree classifications, it depends on how the university itself awards the degree. Not every uni uses 70+ as the benchmark for a first for example. Some unis you have to average 70+ for both your second and third years to get a first overall. Not to mentioning the weighting of each year and possibly individual modules.
This is also influenced by the external moderation as I know for my uni, ALL the first class & third class dissertations are sent to be externally moderated. A sample of 2:1s and 2:2s are sent. Examiners can if they want to highlight when something's been over graded or under graded and thus technically every mark is then changed accordingly.