GEN: Currency of school library collections?

[Shelley Glantz <glantz@MEOL.MASS.EDU>]

A committee of the Massachusetts School Library Media Association (MSLMA)
is currently revising our state standards.
We would like to include info on how current a good school library
collection should be.
We cannot find any information on how to determine this quantitatively.
For example what percentage of the collection should have copyrights less
than 5 years old, etc.?
Information Power talks about number of volumes, and budget formulations,
but does not contain any type of info on currency requirements.

Does anyone know where to find this information, or do you actually have
these stats?

Please respond directly to me.

Shelley Glantz, Library Media Specialist
Arlington (MA) High School
glantz@meol.mass.edu