A site visit to the Karowe operation, which involved testing, on a sample basis, the measurement, collection, aggregation and reporting of selected sustainability information • Inspection and corroboration of supporting evidence to evaluate the data generation and reporting processes against the assurance criteria • Reporting the assurance observations to management as they arose to provide an opportunity for corrective action prior to completion of the assurance process • Assessing the presentation of information relevant to the scope of work in the report to ensure consistency with the assurance observations ENGAGEMENT LIMITATIONS IBIS planned and performed the work to obtain all the information and explanations believed necessary to provide a basis for the assurance conclusions for a moderate assurance level, in accordance with AA(2008).