no change in terms and conditions can be imposed on a workforce.incentives and inducements can be offered to attract people to change from one contract to another.if the options are not attractive,mereley remain on your current pay,terms and conditions.if too few staff choose to transfer to the new contracts,then the operation will be very difficult to implement.waiting for natural wastage could take an eternity to replace current employees with new starters.BA is in a very weak position when proposing to change work practices for thousands of current employees.the columbus proposals may appeal to some and not others.existing staff have nothing to fear in the short term,as change will be a very slow and gradual process,if indeed any change takes place.