The main challenge in establishing the process depicted in Figure is capturing digital data from devices that do not offer interfaces for transmitting data (steps 3 and 4 in Figure ). This challenge is solved by developing an application to be installed on mobile devices which captures images and then processes them into the required digital information. Within the app, each weighing procedure is managed through a task. In a typical workflow, a weighing taski.e. the process of recording the action of weighing a certain amount of a chemical substancecan be started by creating a new task or by selecting an existing open weighing task from a list in the app (see next chapter for how such open tasks are created). Once a weighing task begins, the app starts capturing a live video stream through the mobile device's camera.