COUNTER Code of Practice Release 5
In scholarly publishing, one of the ways to measure a return on investment is to assess circulation and usage statistics. COUNTER is an industry-wide standard made for counting the use of electronic resources. The second draft of Release 5 will be incorporating significant changes in response to the feedback received from both publishers and librarians through a survey.
Besides, a UKSG seminar was held on the same subject on 17 July 2017, and you may download the slides as well as these resources:
The Friendly Guide to Release 5 for Providers
E-book usage: counting the challenges and opportunities (Insights article)