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Article 2: (https://www.projectcounter.org/appendix-glossary-terms/)
Reports for Counter 5 consist of four Master Reports:
  1. PR: Platform Master Report.
  2. DR: Database Master Report.
  3. TR: Title Master Report.
  4. IR: Item Master Report.
Platform Master Report:
A customizable report summarizing activity across a content provider’s platforms that allows the user to apply filters and select other configuration options for the report.
Host Types REQUIRED to Provide: “All”.
 
Database Master Report:
A customizable report detailing activity by database that allows the user to apply filters and select other configuration options for the report.
Host Types REQUIRED to Provide: “A&I Database”, “Aggregated Full Content”, “Multimedia (databases)”
 
Title Master Report:
A customizable report detailing activity at the title level (“Journal”, “Book”, etc.) that allows the user to apply filters and select other configuration options for the report.
Host Types REQUIRED to Provide: “eBook”, “E-Journal”, “Aggregated Full Content”.
 
Item Master Report:
A granular customizable report showing activity at the level of the item (article, chapter, media object, etc.) that allows the user to apply filters and select other configuration options for the report.
Host Types REQUIRED to Provide: “Repository”, “Multimedia”

Source: https://www.projectcounter.org/wp-content/uploads/2017/08/COUNTER-Code-of-Practice_-Release-5_July-2017.pdf    - Page 10