It's a fact! A successful entrepreneur doesn't multi-task

In the short-term, multi-tasking is okay, as long as what you're doing is fairly routine and technically simple. These things are so complex that an irregularity in performing here or there will severely damage the whole process. This is called "continuous partial attention", and it is okay for those everyday, mundane situations. However, the life of a successful entrepreneur, especially when it comes to business, is anything but mundane.