Beyond Project-based Learning
During Bill's teacher career, he was known for creating long-term, integrated, and thematic projects. He called these "Beyond Project-Based Learning" (BPBL). These thematic, integrated projects have been known to address over 140 content standards while making curriculum relevant, interesting, informative, & fun. Formative assessment is embedded. Students are also able to access their natural ability to pretend & play.
Planet X is just one example of the countless subjects that can be addressed when using this approach. A few others include: Sailing the Pacific Rim, an adventure where students "sail" around the Pacific Ocean while performing many oceanographic-related experiments, and Change the World where students learn about topics related to social justice and commit to making some sort of change. There are many others.
I'd be happy to work with you on one that I've done before or to help you create your own.
Planet X- an adventure traveling to an unknown pristine planet
Sailing the Pacific Rim- students "sail" around the Pacific Ocean while performing experiments and learning about different cultures
Our "Sailing the Pacific Rim" culminating simulation. This was the end of a two-month PBL Adventure.