Last week I attended a workshop about a website called Defined Stem. It was created by the people who developed United Streaming. If you have not explored this site, you are missing a treasure trove of resources. While you typically think of STEM resources as being solely for your science, technology, engineering, and math teachers, you will find resources well beyond. As many of the real-life videos chronicle, the STEM professions call on skill sets well beyond strictly science, technology, engineering, and math.
The projects that are already developed in this website follow the Understanding By Design format and are truly project-based learning units. If you strictly think of doing projects as problem-based learning, you are incorrect in your assumption. The following Prezi delineates the difference.