In the summer of 2006, the collections on the Reading Room were reclassified into the LC Classification Scheme. Since that time, LC has been used sparingly as has been deemed prudent. Considerations to keep in mind when deciding whether a new acquisition should be put into the LC Class include whether there is already a useful Houghton class, how much time might be saved putting it in one or another class, and the integrity of sub-collections. For the most part, if an author has not already been established in a Houghton class and there is an LC class for that author, one can choose to give that author the LC class number. Other material will have to be decided upon on a case-by-case basis. See Section IX for issues relating to classifying books for the Theatre Collection.