By listing what you need to do on any special day, you can make sure to keep all for your appointments and not worry whether you've forgotten something.
While most people will still probably need, and be, to some extent, clock-timers, task-based timing should be used when performing a job that requires more creativity.
It may seem obvious that employees should show up on time, limit lunchtime to an hour and turn off cellphones during meetings. But those basics aren't necessarily apparent to many millennials.