The digital age has made it possible to multi-task. Multi-tasking increases productivity because you can do more in a given time. But can you? With certain activities, such as driving while listening to an audio book, this is highly productive. With some activities, you may easily end up producing sub-standard quality or finish none at all.
Like everything, if used excessively, it can actually reduce productivity. People who multi-task too much may start to suffer from lack of concentration. For example, you may sit behind a computer and decide to write a report. However, lots of unrelated ideas about you latest emails, browsing, conversations or daily activities can pop up in your mind that constantly slow you down.
It pays to practice concentration, so that when necessary you can focus as if nothing else matters and give a task your 100% effort.