dottorer <ralf.schroe...@gmail.com>

Is there a data flow diagram of an existing application I could
review? What I am looking for is:

(a) Upload data for a person doing something (like planning a business
trip)
(b) retrieve CO2 footprint of that data (for that trip only, including
air travel, car rental, etc.)

Is this typically done by adding entries over time and then retrieving
them for a period? Or can transactions be grouped? Any starter hints
appreciated!