Which game was developed earlier, Operation or Carcassonne?
Operation (game):  Initially produced by Milton Bradley in 1965, "Operation" is currently made by Hasbro, with an estimated franchise worth of USD $40 million. Carcassonne (board game): Carcassonne is a tile-based German-style board game for two to five players, designed by Klaus-Jürgen Wrede and published in 2000 by Hans im Glück in German and by Rio Grande Games (until 2012) and Z-Man Games (currently) in English.
Operation