RRDI: RTC "Quality of planning" report

 If you're only interested in the numbers, as opposed to the actual list of work items, then you should be able to use Request Baseline (I think the view is VW_RQST_BASELINE). It's similar to WORKITEM_STATES if you're familiar with the BIRT model. It gives you discrete measurements at each ETL run of work item counts. So it can answer the question of, for example, last Wednesday at midnight (or whenever the ETL ran), how many work items were planned for M5 (or in the open state, or owned by James, or whatever). For completed work items per iteration, the Request table might be able to give you what you want there, if it's as simple as querying for work items planned for an iteration and in the closed state (i.e. if you don't care about proving that it actually got closed during that iteration).