The only way a malfunction occurs as the result of a look-aheadoperation is if the predicted results weren't available, such as when the next call is routed to another system.
预先操作失误的惟一情况就是所预测的结果不可用，例如下一个调用被路由到其他系统上去了。
2
While the original aim was to raise the hull if at all feasible, the operation was not given the go-ahead until January 1982, when all the necessary information was available.
Most important, an updated operation plan being set to satisfy the current market, and the consequences of taking various actions are known ahead of time, minimizing cost and disruptive surprises.