This worksheet can be used as classwork, homework, even an exam on shading forms. I used this, however, during class time. I would demonstrate how to shade each form generally, and always based on the light source, while the students shade the forms along with me. This is a great way to have them practice shading. It also includes a value scale for them to use as a guide as to what the value of the shadow, midtone and highlight should be.