However, additional sets of textbooks are available from the Center for Civic Education. That depends on how often your students work on it. Projects have been completed in as little time as four weeks and as much time as twelve weeks. We strongly recommend that your class choose one problem only. Selecting A Problem for Class Study.
Some teachers have their students vote on the problem.
Some try to reach consensus. There are advantages to both. If students vote, the problem is decided on more quickly, but you may not have complete buy-in of every student. If you decide by consensus, you will have complete buy-in of your students but it will probably take longer to decide on the topic. The students will spend a great deal of time and effort on their project.