Sounds like a non-normalized design. Each 15 minute increment is the
smallest chunk you need to record information about, so would that not be the
lowest child on the relationships? If you build that first, you can drop it
into a Person/Date form... but if you're trying to do this as if it were a
spreadsheet, you need to rethink your design. Before you even start the
interface, try adding a few records to your tables and getting the correct
query results. If you don't, you run the risk of coming up with an interface
that appears to work, but underlying table structures that do not allow you
to effectively query the data you have collected.

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