Multitasking makes you stupid. Doing more than one thing at a time makes you slower and worse at both tasks. Don’t do it. If you think this doesn’t apply to you, you’re wrong – it does.
Dr. Jeff Sutherland – American software engineer and entrepreneur, inventor of the Scrum software development process (b. 1941), in “Scrum: A revolutionary approach to building teams, beating deadlines and boosting productivity” (2014), Quotations book 2017