Teachers need to be mindful of this fact. What seems obvious to us is often confusing or daunting to our students. It IS up to us to "sell" the idea of the project, including the validity and the usefulness of it. Students need to be directed and sometimes figuratively hit on the head with the purpose of what and why we are asking them to complete a specific task in a specific way.
This leads to the question for the teachers - are YOU convinced of the validity of the projects outlined in your book? If not, we can talk. Things can be tweaked. Heck, we can even change the whole darned thing if you like. That's the beauty of having our own curriculum.
Either way, if it's regarding our students or our own vision for our classes (including the projects), communication is key. Take a moment to think about the usefulness of the assignments and then take a moment to explain this in class. If you are not convinced, let's work out a solution together in order to make a more 'sellable' project for everyone.