In preparing for a three part lesson on fractions, a team of teachers and support staff work collaboratively to design an appropriate and challenging problem that allows for student choice and can be solved in a variety of ways. The teachers "do the math" prior to the lesson. By solving the problem themselves, they are better able to anticipate potential student solutions and deepen their collective and personal understanding of the mathematics.

Title from videodisc label. "Multimedia resource for professional learning"--Viewer's guide.