Work studies collect data from various processes to organize industrial manufacturing. In particular, the hours of work recorded for manual jobs are a central element of planning, control and payment. Time recording facilitates surveys and analyses of operations. The breakdown of an operation into elementary steps, e.g. reaching, grasping, setting up and joining, is the prerequisite for structured time recording. This enables evaluating a process and iteratively optimizing the total time by reducing individually controllable elements. Work studies have used mechanical or electronic time recording systems to record time by a time sensor.