This document provides an overview of Dominic Cooper's book "Improving Safety Culture: A Practical Guide". It discusses the evolution of safety culture as a concept and provides a model for developing a positive safety culture through a three-level strategy involving immediate, intermediate, and ultimate levels of effort. The document outlines some identifiable characteristics of a good safety culture, including effective safety leadership, well-developed risk control systems, robust safety management information systems, regular safety audits, comprehensive safety training programs, positive safety climate surveys, and high levels of employee involvement in safety. The document argues that assessing these characteristics can help organizations determine whether they have successfully developed and maintained a positive safety culture.