Open e-missions

"No one can anticipate all the useful analyses that can be made of data from planetary missions, and so it is important that it be placed in a public archive where anyone can access it." - Ralph Lorenz, a scientist who studies Titan, Saturn's moon, in Titan Unveiled.

Change (or delete) "from planetary missions" and you have a very good reason for open systems. Indeed, it's Popperian (and Sorosian) Reason Itself.