Hi, I know this does not answer your question but...
Why do some rating levels put the word "competent" at a perceived neutral point e.g. (middle or 0)
If someone is competent at a task then is this not a positive situation as the task will be completed "competently”?
Just thought this might make an interesting discussion.

Language teachers in Europe like the European Language passport:
You can do your language acivities (dear a project?) in Moodle, test yourself with the online program "Dialang" and mark your progress (in levels A B and C) in your own passport. (http://www.dialang.org/english/index.htm)
This are examples in differnt languages, get inspired: http://europass.cedefop.europa.eu/europass/home/hornav/Downloads/LangPassport/ELPTemplate/navigate.action
Having a Moodle scheme, leaning on a modul like teacherplan and attachable to every resource ("read this") and activity ("do this") would be a great help for grading open assignements.
This scheme approach can help to create/exchange sets of scales (""Rubrics") for every open assignment:
- http://www.ericdigests.org/2001-2/scoring.html
- http://www.csd99.k12.il.us/north/library/rubrics.htm
- http://pareonline.net/getvn.asp?v=7&n=3
- http://www.interactiveclassroom.com/materials_performance.htm
- http://webquest.sdsu.edu/rubrics/weblessons.htm
- http://www.k12.de.us/teacher/shane/Rubrics.html
- http://mciu.org/~spjvweb/rubrics.html
Having an archive for storing and exchange schemes IN Moodle.org, something like http://rubistar.4teachers.org/index.php would be nice.
If you experiment with the optional Exercise Module, you will find that it allows you to declare a list of competencies and scores for a piece of wok, rather than the single score associated with an assignment.
It is also setup so that students can self assess these same competencies
However, it does not allow you to declare the competencies in advance, or to integrate these across a course from multiple sources.
Andy D