11.   In past election years, differences over defense spending and foreign policy have been central to the political debate.

12.   Jay was not to be disputed on subjects central to his interests.

13.   Messaging is central to work-group computing that is changing the way businesses operate.

14.   Ownership is obviously central to the disposal of state property - privatization - in the move to a Market economy.

15.   Political theory rests on the assumption that these activities are central to the functioning of a democratic society.

16.   Recognizing this, a number of black parents no longer see integration as central to an improved education for their children.

17.   Retirement has been central to all of these, although the complexity of its impact has yet to be fully explored.

18.   Still central to much of contemporary price theory is the model of perfect competition.

19.   That access is also central to patterns of trade that do not directly involve the United States.