Quote by W. Edwards Deming

There is no such thing as arrival exactly on time. In fact, exactly on time can not be defined.


Other wording: “You can not define being exactly on time.” Also see page 279 of Out of the Crisis. It is a matter of operational definition to define how you measure being on time – that is how to operationalize the concept of on-time for the sake of measuring the process results.


Book: Out of the Crisis