Even parents who place a high value on honesty, regularly use white lies to control their children or present more palatable versions of the truth, with more than 80% of parents lying occasionally.

Preview control, an advanced control method, can use future target value and future disturbance as well as present and past information in deciding the control.

Present international conventional "earned value evaluation principle" as well as how to combine the earned value with project schedule control and cost control organically were also expounded.