Hi, I'm wondering how much prior knowledge I would need to get a lot out of this book. I'm considering taking an undergraduate General Relativity course next semester to help me learn parts of this book. I have some basic experience with curvilinear coords/tensor analysis along with a brief understanding of GR and cosmology from a couple seminars I attended. Has anyone read parts of this book? It seems to be an extremely important reference for modern research in GR. The preface states that it can be used as a graduate textbook, but I get the feeling that it couldn't be used as an introduction, even for a grad course. Theory and Experiment in Gravitational Physics Author: Clifford M. Will Date Published: March 1993 links for more info: adsabs harvard google books about author Also, I'm wondering if anyone knows of other good books for an intro to the PPN formalism for gravity.