12.10 It is sensible that the Department takes a phased approach to the introduction of these new infrastructure and corporate services models, as it is now doing. The DIO and DBS will also need to earn the confidence of the Department and individual TLBs by demonstrating that they can both deliver professional services to users and meet wider Defence objectives. But as the Department makes the transition, it should continue to develop and refine the respective models. We recommend also that the Department should keep an open mind about the future scope of the DIO and the DBS, to ensure that it exploits their full potential to drive further improvements in effectiveness and efficiency. There is the potential for the DIO or the DBS to take on responsibility for other estate-related functions, such as guarding, which are currently performed elsewhere in the Department, and for the DBS to build on the 'critical mass' of corporate services it is currently planned to deliver on launch and in its early years.