The 7th Grade Mexico Project on the left is evidence of a curriculum which allows diverse learners to make choices based on personal interests and skills. Option #1 is a good project for a traditional academic performer and/or a student who is interested in science. Option #2 works well for students interested in people, political movements and/or has artistic skills. Option #3 is best for a learner who is more kinesthetic (building a timeline) and has a sports interest.
My book review on Howard Gardner's "The Disciplined Mind" explores the importance of different learning styles and gives some ideas about how teachers can serve these differences.