A. A directors technique for directing plays is always evolving
The answer to your question would be sarcasm XD
1.the internet
2 online catalogue (or less often card catalog) usually found on a PC and the front of the library
3 Author's name, title and call number
4 A number that indicates a books category and where to locate it in the library
5 the Dewey Decimal System on the library of Cosngress system