The Sun-Earth Connection Roadmap formulates the science themes and objectives of the NASA's Sun-Earth Connection program in terms of three quests and outlines sixteen candidate missions that can achieve the goals of the quests. The missions are organized in five campaigns, according to the science themes and objectives that a particular set of missions is intended to address. Because the phenomena to be understood are often inseparably linked, each campaign is relevant to more than one quest, and some missions are included in more than one campaign (although each mission is primary to only one campaign). The interrelationships among the quests, campaigns, and missions are illustrated schematically in the figure above.