One row per problem per student. Compared to an action file, it will have few rows, as for every problem solved, a action file will have at least a "start" row (indicated the time stamp the student was exposed to the problem) and at least one "attempt" action row, and finally a "end" row indicated these students moved to the next problem. All of that info is collapsed in this problem level file.
How to look at this file This spreadsheet corresponds with the action level data shown on the Action Level Data Page.
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