Call of Duty is an example of a fixed-ratio schedule as the goal of playing the multiplayer game mode is to rank up to level 80, which is the end of the levels you can achieve. Each level has a set number of XP you must earn based off of how many many kills you get, how many objectives you complete and other goals of that sort. After you receive the amount of XP needed, you get to level-up which leads to new weaponry and perks. Though it does not occur immediately after each round you play, you are eventually rewarded for gaining the amount of XP needed for the level you are on. As most people who play the game know, the majority of people who play Call of Duty don’t play just to play the game, they want to rank up to level 80 then prestige, starting the process all over again, to show how good they are at the game.