In 2010 BAE Systems conducted a review of the management of product safety across all its sectors. The review examined many issues associated with the safety of the company's products and consulted widely with its businesses around the world. The outcome of the review was a set of four principles: Accountability, level of safety, conforming products, learning and sharing information. The principles were tested by examining how six other sectors (automotive, civil aviation, construction, health, offshore, and rail) address their equivalent challenge. This paper explains the four principles and provides detail of the associated research and findings.