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With approval of the MLB Commissioner, a player on a minor league Domestic Reserve List can be placed on the Development List if the player is at the parent organization's Minor League Spring Training Complex or at a club-approved training facility for the purpose(s) of conditioning and/or development, or if the player has been loaned to a club in another MLB organization, to a club in the Mexican League, or to a club in an independent MLB partner league.
NOTE: There must first be an agreement in place between MLB and the partner league before players under control of MLB organizations can be loaned to a club in that league.
A player on Optional Assignment from an MLB Reserve List (40-man roster) can be placed onto the Development List of the minor league affiliate to which he has been optioned, but only with consent of the player.
A player cannot be placed on the Development List for the purpose of injury rehabilitation or disciplinary action.
A player can be placed on the Development List only during his minor league club's regular season, the player must remain on the Development List for at least seven days, and the player must be reinstated from the Developmental List no later than the day after the conclusion of his minor league club's season.
A player on the Development List counts against the in-season minor league 180-man Domestic Reserve List (or MLB 40-man roster if the player is on Optional Assignment), but he does not count against the minor league club's Active List roster.
A player is paid by the MLB club while he is on the Development List.