Watch how you word these things. "How did the New Jedi Order Coalesce?" Luke Skywalker rebuilds the Jedi with the blessing of the New Republic, first training a dozen students before slowly gathering more and more; by the time of the Legacy of the Force books, they number in the hundreds.
"How did the New Jedi Order Collapse?" Darth Krayt and his "One Sith" secretly sabotage public opinion against the Jedi Order, then manipulate the Fel Empire into moving in on the Galactic Alliance and the Jedi. The Jedi are defeated and the survivors spread out into the galaxy and as of the current comic series are slowly picking up the pieces now.