If goals are unreasonable, or someone is nagging, the resulting stress can worsen symptoms. 如果目标是不合理的，或某人是挑剔的，对结果的紧张会使症状恶化。
In practice most often the worst case implemented in control law does not take place and the resulting large control inputs become unnecessary and uneconomical. 在实践中通常大部分最差的案例在控制定律下执行确没有发生并且作为结果的大的控制输入变得不必要和不经济的。
