It’s hard to find the requirements for grad students on the current FIW website, so here’s a direct link! Go to the Grad student requirements page and then follow the links there. The Degree Requirements link is particularly useful. However, if you want to know what the requirements are for the grad school in general, you have to go here where you will find all of the credit requirements that have to be filled on top of the FIW department requirements.
(The department may make changes to the website layout. If this link is no longer correct, please let the webmaster know!)