Denise,
It varies in content, format, and length. The idea is to sample your students early on to see what prior knowledge they have. Then, based on examination of the overall results, an instructor may see that students are really strong in one area or really weak in another area. So, based on your observations, adjustments in amount of time spent or where emphasis (more or less)is needed, planning your class by spending time on material that needs no emphasis is avoided. It can be short (7-10 questions) or lengthier (35-50 questions). Also, true false, multiple choice, or fill in… >>>