Even if you think you are multitasking you are actually doing one thing at a time, aren’t you? You might have five tasks on your hands, but I’m sure you don’t do all five things at the same time. You are writing an e-mail. You stop writing it and take a phone call. You hang up and continue writing the e-mail. A colleague comes to you with a question. You stop writing your e-mail and answer the question and so on. So forget about multitasking. Focus on doing one thing at a time and do it with concentration!!