Aspects of the present invention relate to a control system (1) for identifying at least a first activity performed by a person of interest (POI-n). The control system (1) includes a controller having a processor (20) and a system memory (26). The controller (13) is configured to receive image data (DIMG1, DIMG2) from at least one imaging device (C1, C2). The image data (DIMG1, DIMG2) includes at least one image frame representing an image scene including at least a portion of a person of interest (POI-n). The image data (DIMG1, DIMG2) is analysed to identify a skeletal model (15) of the at least a portion of the person of interest (POI-n); and at least one object of interest (OOI-n) with which the person of interest (POI-n) is interacting. The first activity being performed by the person of interest (POI-n) is identified in dependence on the skeletal model (15) and the identified object of interest (OOI-n). The present invention relates to a related method of identifying an activity being performed by a person of interest (POI-n). The present invention also relates to computer software and a non-transitory, computer-readable storage medium storing instructions thereon.