One of my college professors, Larry Sabato, has written a timely and engaging book, A More Perfect Constitution: 23 Proposals to Revitalize Our Constitution and Make America a Fairer Country.
For me, the biggest surprise of the book was learning that Article V includes not one, but two processes for amending the Constitution. The process that has never been taken, and that Sabato discusses at length, is a Constitutional Convention, to be called once two-thirds of the states petition for it.
Sabato's specific proposals and the years of public debate that would go into a successful constitutional convention would not only increase our government's efficiency, but also bring many more people into the conversation about the kind of society and world we want to build. It's a thorough, moderate, and inspiring book.