In the professional world, checklists are a huge component to the daily work of pilots and surgeons. Detailed step-by-step checklists help fight complacency in the cockpit, and maintain safe operation of the aircraft during all phases of flight, from gate to gate. In hospitals, medical teams use checklists to ensure surgical procedures go smoothly.
The checklists are prioritized lists of all the tasks that you need to carry out. They list everything that you have to do, with the most important tasks at the top of the list, and the least important tasks at the bottom.
But in you’re in an operational role, or if tasks are large or dependent on too many other people, then it may be better to focus on a longer-term checklist, and "chip away" at it day-by-day. Many people find it helpful to spend, say, 10 minutes at the end of the day, organizing tasks on their list for the next day.
Do you often feel overwhelmed by the amount of work you have to do, or do you find yourself missing deadlines? Or do you sometimes just forget to do something important, so that people have to chase you to get work done? All of these are symptoms of not keeping a proper "To-Do List."