Computer-implemented method for providing an audit record that relates to activities (210, 220) performed by human operators within a facility in interaction with technical equipment, wherein the audit record indicates performance of an activity sequence (210, 220) with a first activity and with a subsequent second activity by either the same human operator or by different human operators (201A, 201Z), the method comprising: receiving a series of images (701, 702) that visualize activities (210, 220) by human operators, the series with at least a first image of a first activity in interaction with first technical equipment, and a second image of a second activity in interaction with second technical equipment (301B, 301C); characterised by applying image-processing to the first image and to the second image, separating, within the first image and within the second image, at least first (701x, 702x) and second (701y, 702y) areas, wherein the first areas (701x, 702x) comprise biometric image data indicative of a particular human operator within the set of human operators belonging to the manufacturing facility, and wherein the second areas (701y, 702y) comprise image data indicating the interaction with the technical equipment (301A, 301B, 301C); by applying image-processing to the first area of the first image and to the first area of the second image, obtaining identifiers (ALPHA, BETA) of human operators among the multiple human operators, the identifiers (ALPHA, BETA) thereby indicating performance of the first activity and of the second activity by particular human operators (ALPHA, BETA); by applying image-processing to the first area of the first image and to the first area of the second image, removing biometric image data indicative of particular human operators (ALPHA, BETA) from the first area of the first image and from the first area of the second image, so that the first area of the first image is modified to a modified first area of the first image and the first area of the second image is modified to a modified first area of the second image; by combining the modified first area of the first image with the second area of the first image to a modified first image, and combining the modified first area of the second image with the second area of the second image to a modified second image; and by providing the audit record by storing the modified first image, the modified second image with the respective identifiers (ALPHA, BETA). receiving a series of images (701, 702) that visualize activities (210, 220) by human operators, the series with at least a first image of a first activity in interaction with first technical equipment, and a second image of a second activity in interaction with second technical equipment (301B, 301C); characterised by applying image-processing to the first image and to the second image, separating, within the first image and within the second image, at least first (701x, 702x) and second (701y, 702y) areas, wherein the first areas (701x, 702x) comprise biometric image data indicative of a particular human operator within the set of human operators belonging to the manufacturing facility, and wherein the second areas (701y, 702y) comprise image data indicating the interaction with the technical equipment (301A, 301B, 301C); by applying image-processing to the first area of the first image and to the first area of the second image, obtaining identifiers (ALPHA, BETA) of human operators among the multiple human operators, the identifiers (ALPHA, BETA) thereby indicating performance of the first activity and of the second activity by particular human operators (ALPHA, BETA); by applying image-processing to the first area of the first image and to the first area of the second image, removing biometric image data indicative of particular human operators (ALPHA, BETA) from the first area of the first image and from the first area of the second image, so that the first area of the first image is modified to a modified first area of the first image and the first area of the second image is modified to a modified first area of the second image; by combining the modified first area of the first image with the second area of the first image to a modified first image, and combining the modified first area of the second image with the second area of the second image to a modified second image; and by providing the audit record by storing the modified first image, the modified second image with the respective identifiers (ALPHA, BETA).