In the chapter Err is Human, Norman talks about how humans make mistakes all the time. He says they often make mistakes wile doing everyday tasks, that they are used to doing. One example from my life is driving. When i first started to drive, I was careful, and made sure to stop at stop signs, and use my blinker. After a year of driving I failed to stop at a stop sign, luckily there wasn't anyone crossing. This example shows that when things become routine people begin to make "slips".