Starting the next task before the first task is complete is lead.
In the eyes of some businesses, a "lead" is a contact that has already been identified as a potential client, whereas for other businesses, a "lead" is any sales contact. However, a lead's potential to become a future client is the same regardless of how it is defined.
A lead is, to put it simply, a person or group who is interested in what you are selling. Contact details are shared, such as an email address, a phone number, or even a social network account, to demonstrate the interest.
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The answer to this is probably something like the human factor or a human error. That is because no matter how great the conditions are, you can't prevent people from making a mistake eventually and this can include even simple things like falling down stairs. What you can do is make sure you get good employees, but even those banal injuries still count as a workplace accident and the worker needs to be paid and covered to mend it.