The most common use case for Axon is general contractors reviewing daily logs from sub contractors on a construction project. However because the system can be used for more than just that situation we call the two sides of the system Reviewers (general contractors) and submitters (sub contractors).
There are some situation where there could be a large sub contractor who wants to collection reports from their subs. In this situations the sub contractor would be the reviewer and the sub of sub would be the submitter.