Systems check and checklists are vital to consistent quality and improvement. When a team thinks they are so good that they don’t need the reminder that a checklist provides, they have lost the game before the game even started. Operating without a checklist is a lot like driving without a seat belt. There is a overinflated sense of indestructibility. Life happens; drive defensively. Don’t be that guy who, in the aftermath of an unforeseen circumstance, has to explain why everything wasn’t done to prevent the unfortunate outcome. Seatbelts and checklists save lives.