NuAspect was commissioned by London Underground to undertake a review of signalling installation and testing activities to identify issues and risks resulting from organizational changes. NuAspect recommended interim control measures and implemented selected measures within eight weeks. NuAspect developed an integrated program of workstreams to implement the interim measures. The measures were developed and deliverables produced on schedule. An overarching process model was developed to provide reference for signalling installation and testing activities.