Rubrics make grading difficult assignments easier, because you have established guidelines. Students can decide what grade they want to achieve and follow the criteria for that grade -- it eliminates grading questions from the student and educator.
Authentic Assessment Toolbox
A web site that is a how-to hypertext on creating authentic tasks, rubrics and standards for measuring and improving student learning.
Rubric Builder at http://landmark-project.com/classweb/tools/rubric_builder.php?
Family Education Network, Assessment, How to Weight Rubrics, at http://www.teachervision.fen.com/page/4525.html
Relearning by Design, Inc., Rubrics, at: http://www.relearning.org/resources/PDF/rubric_sampler.pdf.