Method of setting system and processing device

A method of setting a system,

• the system including:
• a processing device including a processor and a memory;
• and
• a sensor that is communicably connected to the processing device and detects an amount of goods,
• the method being performed by the processor and comprising:
• (a) when receiving detection of a first amount of goods by the sensor, displaying, on a display, a first screen prompting setting of a threshold amount of goods which corresponds to a condition of trigger output, the first amount being equal to or larger than a first predetermined amount;
• (b) when the sensor detects that an amount of goods has been reduced by at least a second predetermined amount after the displaying of the first screen, acquiring, as the threshold amount, a second amount of reduced goods detected by the sensor;
• (c) after the threshold amount is acquired, displaying, on the display, a second screen for setting a first action of the processing device;
• and
• (d) based on information on the first action which has been set after the displaying of the second screen, setting first output contents which are to be output by the processing device upon satisfaction of the condition of trigger output.