The FTS database records flows of funding, and draws boundaries around (combinations of) flow properties to calculate totals. Examples of common boundaries are a response plan/appeal or a combination of a (donor or affected) country and a year. Drawing a boundary classifies the flows in the database into those crossing the boundary inward (incoming flows), those originating and terminating within the boundary (internal flows), those crossing it outwards (outgoing flows), and a fourth category that is not displayed  - those that are irrelevant to the boundary because they originate and terminate outside of it.