The Venus In Situ Explorer (VISE) has been a lander mission concept proposed since 2003 by the Planetary Science Decadal Survey as a space probe designed to answer fundamental scientific questions by landing and performing experiments on Venus. The VISE concept has been identified as a desired theme for mission proposals over several rounds of NASA's competitive mission selections, including those to select the 2nd, 3rd and 4th New Frontiers missions. However, all VISE-themed proposals have thus far been unsuccessful.