by Dan Marsden.
I'm not sure if Doug realised you mean the advanced grading methods in 2.3
These might help:
http://docs.moodle.org/23/en/Marking_guide
http://docs.moodle.org/23/en/Rubrics
The main difference is that when the teacher is grading, Marking guide lets you enter a number as the grade for a criterion - Rubric has preset levels for each criterion that the teacher can select from when marking that criterion.
Marking guide also lets you build a set of frequently used comments to use when marking.