The tension in the air was palpable. Every face in the room was animated, busy arguing a point, making more demands for new product features, or challenging the daunting task being presented. Work was being planned, then erased, re-visited, and planned again. The task was clear and there were timelines that had to be met. There was no way to discriminate between the two equally-engaged classes involved except that the Grade 3 students tended to jump around and wiggle a lot when they were excited and the Grade 10 students tended to try to look cool, calm and in control, never betraying their own excitement.