Explains a set of processes that teachers might use to structure their evaluation of students' learning and understanding. Illustrates the processes of setting goals, deciding what to assess, gathering information, and using the results through a measurement task requiring students to estimate the number of popcorn kernels in a container. (MDH)

Reports an example of one lesson from a sequence of lessons on fractions from a sixth grade class in which the teacher revises her plans after observing students' small-group work and interactions. The lesson illustrated the teacher's knowledge of mathematics, how students think, and how to observe that thinking. (MDH)