The Choosing is the period of time when a new Council, and possibly a new general is chosen. After 6 years of a Council Member's term, he/she must go to Cahill Island where the Cahills will determine whether or not he will remain in his position for another six years. A Cahill General is the only one who can be considered for that position, along with other council members.
A Cahill Council Member can be demoted during the choosing. For example, if Cahill One's term is ending, the people can choose to put Cahill Three or Cahill Two as Cahill One, and give Cahill One another role. Since deciding generals and such is the role of Cahill Three, Cahill Three decides whether or not to keep a general in his position.