So you may give a skater 3.6 initially for technical, but then take off all the various deductions and you could end up with a technical score of 2.2. Because if they fell that is .4, then 2 foot landing could be .2 and so on.
Then you had to total your score for each skater. So 2.2 tech and 2.7 presentation = 4.9.
And then with all the other skaters you are doing the same and considering those previous scores you gave other skaters, you are actually coming up with a total score for each skater which then slots the skater into position.
We still use this for our beginner levels and whilst their may not be deductions on jumps per say, we do have rules such as they can't do an element from a higher level which requires a .2 deduction. When you are judging a field of say 10 skaters, as each skaters goes along, you are constantly working out if that skater was better than a previous skater or worse than a previous skater, then trying to allocate a score that fits in with that skater's position. Seriously it is a pain in the arse system.