How to find the unused tables in a schema

Hi All,
I have a schema in my database in which some of my web portals runs. I have n number of tables in the schema but I beleive some of the tables which are not using for a long. How do I find those or list those tables which are not using for long?
Please help,
-Thanks & Cheers
Antony

Although your question is directed to Aman, I want to let you know that auditing "will" affect the performance of the database. And auditing will catch select statements too even using "successful and nonsuccessful" selects
Kamran Agayev A. (10g OCP)
http://kamranagayev.wordpress.com
[Step by Step install Oracle on Linux and Automate the installation using Shell Script |http://kamranagayev.wordpress.com/2009/05/01/step-by-step-installing-oracle-database-10g-release-2-on-linux-centos-and-automate-the-installation-using-linux-shell-script/]

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