Dan Meyer's Three-Act Math Tasks - Google Documents | Eclectic Technology | Scoop.it
From docs.google.com - February 9, 2012 8:46 PM

Act 1 - a video that sets up the problem to be solved and raises questions; Act 2 - additional information provided to help solve the problem and more questions; Act 3 - the result with the video back with new information plus a sequel. Authentic math to challenge learners!