This first chapter from Rick Wormeli's book, Fair Isn't Always Equal, makes a compelling case for differentiated teaching. He explains that undifferentiated classes (one size fits all) are actually the easy ones because they make it simpler for a student to coast or drop out. Wormeli uses examples from the military, medicine, and automotive repair fields to show how the real world is differentiated. This selection can help academic and career-technical teachers develop a mind-set for differentiated instruction that will engage students and maximize their learning. (sec)