This is the second edition of my book Galaxy Formation.Many people liked the first edition which appeared in 1998, just before the explosion of magnificent new data which have completely changed the face of astrophysical cosmology. Many of the agonies which had to be gone through in the first edition have disappeared and, to many people’s amazement, including mine, there is now a concordance model for cosmology, the cosmologist’s equivalent of the particle physicist’s standard model. Just like the standard model, however, the concordance model creates as many problems as it solves. This is not a cause for concern, but rather one for celebration because we are now able to ask much better and deeper questions than in the past. These questions indicate clearly the need for physics and astrophysics ‘Beyond the Concordance Model’.