Update http://docs.moodle.org/en/Development:Grades to describe the current workings of the Gradebook in Moodle 2.

Add a section describing the behaviour of hidden items and categories

Add a section describing the behaviour of overriden item.

Describe how the new grade settings for activities will work, with the common module grade settings in a new group called "Grades" on mod_form.php, provided by the gradelib and stored in the grade tables only.

Describe a new plugin system in the gradebook system for grading interfaces that implement a grading process. The first/main one would look like the assignment grading interface, and take a module id as a parameter, and would implement all the grading/commenting interface. The only thing this interface needs to get from the module itself is the "stuff" to grade. This could be a HTML fragment returned by a standard-named function in
mod/xxxx/lib.php.

Once complete notify Helen to link/label the page appropriately to be the current definition of how the grading system works in 2.0