The COUNTER Foundation class explains the metrics of the Master Platform Report. Download from the COUNTER website here.

Manual for Librarians - Module 1: Book Usage available now for download from the COUNTER website here. The second module, about journal metrics is under construction and will be available soon. 

COUNTER provides the standard that enables the knowledge community to count the use of electronic resources. Known as the Code of Practice, the standard ensures vendors and publishers can provide their library customers with consistent, credible and comparable usage data. https://www.projectcounter.org/