The projects in my class are consistently worth 50 OR 100 points. This means I can have a "generic" rubric for the students to be graded on. These rubrics allow me to have a grading system in place that the students understand and gives them some regularity in a normally chaotic classroom. I love having my students grade themselves and leave me notes regarding their project as it helps me when I grade their work. This also gives me a chance to communicate to them what they need to work on when w