Dear Mam, 

According to ALA Minimum standard for public library system "Out dated, seldom used and shabby items remaining in the collection can weaken a library as surely as insufficient acquisition."
In course of time some books in the library become outdated (e.g. books with statistics). Some time later research result into making information in earlier edition inaccurate. Similar are books less circulated or fatigued one. Not all old books are valuable in each library. The need for weeding out such books can not be over emphasised. The following steps are suggested for weeding out unwanted material.
1. Arrange such books in correct order
2. Assemble the necessary relevant catalogue record
3. Put a disposition slip in books to be withdrawn.
A tabular record for books withdrawn/weeded as per illustration may be maintained. In all such cases approval of the relevant parent body also must be taken before effective withdrawal/weeding.

Thank You