It is important to give students a rubric prior to the studentss tarting to work on a project or assignment so they know up frotn what is expected of them. I use rubrics all the time to assess their knowledge on a topic, i.e. if we covered a lesson on how to follow a recipe & measure ingredients correctly, I have the students go through stations to practice measuring flour and brown sugar (which are not measured the same way), liquid ingredients & also using measuring smaller amounts with measuring spoons. I give them a rubric & they practice measuring & receive a grade as they complete the"hands-on" demos within the stations. Again, communication is key!