Senator McKENZIE (Victoria—Minister for Agriculture and Leader of The Nationals in the Senate) (14:30): Government always seeks to use the very best science available on which to make policy decisions. You will recall this process was set in place many years ago. It has required state governments to also do a lot of work on constraints et cetera within their own jurisdictions. I remember when the plan first came into place and we didn't realise that the Barmah Choke was even going to be the constraint that it is on moving the volume of water that needs to go from one end of the basin to the other. So a lot of work has been done by state governments in all the jurisdictions affected and by government agencies to ensure that we are making the best decisions possible, given the available science. That will continue. It is not just the Murray-Darling Basin Authority who has conducted— (Time expired) The PRESIDENT: Senator Roberts, a final supplementary question?