Only a few directors and screenwriters have enjoyed the publication of their collected works, which can include scripts and other writings (note that many Japanese directors have been prolific writers). Scripts can be very helpful in confirming what was said in a film, or what was supposed to be said, but was changed on the set. “Scenario literature” has been so valued in Japan there are a lot of script collections, but often it is the screenwriter’s preferred version that is published, not the exact one that was filmed. Remember the Tanikawa’s Shinario bunken is a great index to published scripts (see "Bibliographies").