Flexible constraints are As Soon As Possible, As Late As Possible, Finish No Earlier Than, Finish No Later Than, Start No Earlier Than, and Start No Later Than.

• 弹性限制是“越早越好”、“越晚越好”、“不得早于。完成”、“不得晚于。完成”、“不得早于。开始”以及“不得晚于。开始”。