This is something I work on every day. If somebody asks me to do something, sometimes their lucky if I remember what it was half an hour later. I get distracted easily. But the research consistently shows that we’re at our best when we’re focused on one thing at a time.
Sometimes you have to multitask. Sometimes your job is interruptions or multiple balls-in-the-air juggling. But as much as you can. Do one thing at a time.
Multitasking is evil.