How hard is it to follow instruction

To follow instructions is one of the most difficult thing to do in life.In some instances people do not follow instrcutions deliberately, may be in defyance to a certain system which they opposes.Spme time they did not comprehend what was said as per the instruction , but when asked whether they understood the instruction , they will answer yes. An example is that of a group of people sitting on one room then you ask them to whisper to a person next to him or he these words"How hard is it to follow instructions "up untill the last person in the room.You will find that the whole instruction has been twisted/distorted when you ask the last person.So whether it is the a workplace or at home especially those who are in management positions whether people have been trained to do their work or how experience they are , ensure that they are reminded at all times about the work instruction otherwise face the consequences of what can be the biggest catastrophy/disaster at your home or work environment