Invention is an arcane process in EVE Online by which limited-run blueprints for most of the advanced, tech two items are produced. Ten Ton Hammer Contributing Writer, Space Junkie, sets sail in these stormy waters to explain, simply, and help you figure out just how the heck Invention works.
Invention is the process of converting tech one blueprint copies into tech two blueprint copies. It seems intimidating and difficult, at first, but once you figure out the general process and it all clicks, you will realize how easy it is to make extra ISK given a little bit of legwork and some minimal start-up capital.
Read more about it here.