Structural Commissioning is the logical evolution of building commissioning services, but there has never been a ‘commissioning’ step to ensure that structures have the needed capacity to withstand severe wind and seismic events. Wayne, Alan and John introduce details of a holistic process by which newly completed and existing structures can be assessed for performance and accepted per code requirements. This process is non-invasive and non-intrusive because it uses ambient conditions to collect accurate measurements and does not require expensive or complex methods. The process allows for identification of the displacement per unit-imposed force, and a measure of non-linear structural damping. Both of these characteristics are compared with normal values implied by design requirements and the structure’s capacity. Structural Cx gives buyers assurance that they’re getting a safe building, and gives the public assurance of structural safety. Further, it provides a critical element of feedback to the designers, developers and contractors about the outcome of that building process.