With respect to the specified sustainability perform ance information of the Sustainability Report we per formed amongst others the following procedures: understanding the management of specified per formance information and information collection processes; reviewing the design of systems and processes for managing specified information; enquiring on a sample basis of individuals with over all responsibility for information measurement and collection (from source to aggregation) and report ing about the information collection processes; carrying out analytical procedures (e.g. trend analysis); observing and inspecting on a sample basis man agement practices, process testing and evidence gathering (from source to aggregation); limited testing of detail on a sample basis (e.g. re-performance of calculations); collecting and evaluating documentary evidence and management representations to support the assurance work undertaken.