Esperanza,
A good plan-B should be developed so that it can be substituted for plan-A and achieve the same outcome. I think a good back-up plan is low tech, can be implemented on short notice, closely related to the topic, and be beneficial for student learning. The students will not like feeling they're just filling time. Keeping the activity related to their career field is a sure-fire way to keep interest.
Barry Westling
