Running safe to fail experiments that provide learning opportunities is the best option to improve staff behaviour, as it aligns with the ITIL 4 guiding principle of progress iteratively with feedback1. This principle encourages the use of experimentation and learning from failures to improve the service and the organization. By running safe to fail experiments, the staff can test new ideas, learn from the outcomes, and adapt their behaviour accordingly. This can foster a culture of innovation, collaboration, and continuous improvement in the IT department. The other options are not directly related to improving staff behaviour, but rather to improving the efficiency and effectiveness of the service delivery. Comparing the cost of delay between work items to ensure that financially valuable work is prioritized is a technique for value stream optimization, which is part of the ITIL 4 practice of service value stream management2. Implementing CI/CD tools to deploy software quickly is a method for achieving high-velocity IT, which is one of the ITIL 4 specialist modules3. Adopting Kanban boards to visualize the flow of work across software development teams is a tool for implementing agile and lean approaches, which are also part of the ITIL 4 framework3. While these options may have some positive impact on staff behaviour, they are not the primary focus or the best way to achieve it. References: 3, 2, 1