When people question the importance of checklists, I quickly mention pilots as an example. Would you like your pilot to fly the plane using a checklist or fly the plane based on what he remembers?
Many airplane crashes are caused by pilot error. The same is true in our life. Most of our failures come from not doing what we are supposed to do at the right time.
On a personal level, checklists can help you get everything done you have said you will get done. Throughout an organization, checklists will help you provide better service, implement better financial controls, and provide better training for employees.
If you don't currently use checklists, start by sitting down with a clipboard. Gather the rest of the team around and pick one process, such as opening the business every morning. Collect all the steps and tasks involved with opening the business. Once your checklist is in place, move on to the next process.
A checklist will help you complete every step along the way so you don't miss the details.