To be honest it all started as a joke when this tweet became one of the most popular in the IT world. I am sure you know it:

 

The problem

The truth is everybody needs to do multitasking today. The real cost of it  is hidden, but you’ll definitely lose at least 40% of your productivity if you are constantly switching between apps. Let’s try and do some other stuff in between. 🙂

40%: This is too much!