National Council of Teachers of Mathematics
The Math Forum: Math World Interactive
MathWorld Interactive "Is a FREE project where students in grades 6 to 8 from around the world work on open-ended problems." Go to the Frequently Asked Questions section for an easy introduction.
Other
Developing Project Based Learning Units: Driving Questions
Learn how to use open-ended and directed questions to drive the development of driving questions for project-based learning to take place. This includes several charts and checklists to help teachers develop good driving questions or to...
TeachEngineering
Teach Engineering: Testing the Edges
Students gain experience using the software/systems (engineering) design process, specifically focusing on the testing phase. This problem-based learning activity uses the design process to solve open-ended challenges. In addition to...