This chapter introduces the key human factors and systems thinking methods that were employed throughout the research programme. Measuring workload is of increasing importance within human factors as systems become more complex, imposing ever-increasing demands on workers and users. The Hierarchical Task Analysis (HTA) method was developed in response to a need to better understand cognitive tasks brought about by the changing nature of industrial work processes during the 1950s and 1960s. Several of the methods already discussed are used by human factors practitioners and researchers to inform design by providing analytical findings or insights, which can be incorporated into the system redesign process. Inspiration cards and card sorting techniques are commonly used within participatory design activities. The types of documents reviewed to inform our HTA and Cognitive Work Analysis (CWA) analyses included engineering standards, road rules and legislation, policy documents and government reports.