We have the most educated society in history and we have achieved a lot. Yet, sometimes success eludes us for avoidable reasons. Not only are these failures common, from medicine to finances - but they are also frustrating. Atul Gawande argues that the reason is obvious: “The volume and complexity of what we know has exceeded our individual ability to deliver its benefits correctly, safely, or reliably. Knowledge has both saved us and burdened us.“ In response to increasing complexity, we have become increasingly specialized. The growing breadth and amount of knowledge are not the only things that make things more complicated, although they certainly contribute significantly. The biggest role is played by the implementation of procedures. In every field, from medicine to construction, there are a number of practical procedures, policies and best practices. Modern professions, such as medicine, with their brilliant successes but also failures, pose a significant challenge: “What if expertise is not enough? What if even super-experts make mistakes? ”To overcome this, we need a strategy. Something that is based on experience and uses the knowledge that people have, but somehow also compensates for our inevitable human shortcomings. We need a checklist. The science of quality assurance has become an integral aspect of medical practice. One critical component of this new period is the development, implementation and refinement of checklists. Surgeon and journalist Atul Gawande wrote the book "The Checklist Manifesto: How to Get Things Right" where he states a simple assumption: "Checklists are an effective way to reduce error." Gawande not only talks about the checklist, but also cites his personal experience in designing and implementing a checklist as part of a World Health Organization (WHO) project to reduce morbidity and mortality due to surgery. In those hospitals where the WHO Surgical Safety List was conducted, surgical complications were reduced by an average of more than a third. This is a significant reduction and has saved hundreds of lives. The use of safety checklists in medicine is evolving rapidly. Patient safety checklists, which have long been a mainstay in surgical operating theaters, are still inconsistently designed and unevenly applied in cardiac catheterization laboratories. Although the use of a surgical safety list has become standard practice in operating theaters around the world, the use of a pre-procedure checklist has not been routinely adopted in interventional cardiology.