Multi-tasking is cognitively exhausting, doesn't improve performance!
A leading media studies professor has banned the use of electronics in class.
"Multi-tasking is cognitively exhausting; ... Even when multi-tasking doesn’t significantly degrade immediate performance, it can have negative long-term effects on “declarative memory”, the kind of focused recall that lets people characterize and use what they learned from earlier studying". http://www.washingtonpost.com/blogs/answer-sheet/wp/2014/09/25/why-a-leading-professor-of-new-media-just-banned-technology-use-in-class/