charanjit singh
Involved In Discussions
Talking about operator (and also inspector) errors, many years ago it was estimated after a number of experiments, that 100% visual inspection is effective only between 80 - 90% on the average.
Years ago, in my lecture classes, I used try out a game to see how far this was true.I would distribute a copy of a small paragraph to each participant, give them a fixed amount of time (e.g. 30 seconds) and ask them to write down the number of a given letter (say 'a' or 'd' etc.) they could find. After the specified period I would ask them to read their answers one by one. And there would be laughter when one person said '10'. the next said '13' followed by 8, 12 etc.. Invariably i found that the average error was within 10 to 20 % in a group of around 20 participants.
Years ago, in my lecture classes, I used try out a game to see how far this was true.I would distribute a copy of a small paragraph to each participant, give them a fixed amount of time (e.g. 30 seconds) and ask them to write down the number of a given letter (say 'a' or 'd' etc.) they could find. After the specified period I would ask them to read their answers one by one. And there would be laughter when one person said '10'. the next said '13' followed by 8, 12 etc.. Invariably i found that the average error was within 10 to 20 % in a group of around 20 participants.