Abstract: An image forming apparatus includes: a hardware processor that sequentially guides a worker to a plurality of work stages and determines completion of each of the plurality of work stages with a completion-determination method; at least one sensor capable of detecting a final state of at least one work stage of the plurality of work stages; and a voice inputter capable of receiving a voice input from the worker, wherein the plurality of work stages is classified into a first type of stage and a second type of stage in advance, and the hardware processor: determines, in a case where a current work stage in the plurality of work stages belongs to the first type of stage, completion of the current work stage; and determines, in a case where the current work stage belongs to the second type of stage, the completion of the current work stage.

Abstract: An image forming apparatus includes: a sensor that detects discontinuation of printing or a decrease in print speed; and an electric circuit configured to set an available time to print according to an amount of advance payment; count a usage time during which the image forming apparatus is used; determine permission or prohibition of printing based on the available time to print and the usage time; determine whether to count the usage time based on a factor for the discontinuation of printing or the decrease in print speed when the sensor detects the discontinuation of printing or the decrease in print speed; and prohibit printing when the counted usage time reaches the available time to print.

Abstract: An image forming apparatus includes: a sensor that detects discontinuation of printing or a decrease in print speed; and an electric circuit configured to set an available time to print according to an amount of advance payment; count a usage time during which the image forming apparatus is used; determine permission or prohibition of printing based on the available time to print and the usage time; determine whether to count the usage time based on a factor for the discontinuation of printing or the decrease in print speed when the sensor detects the discontinuation of printing or the decrease in print speed; and prohibit printing when the counted usage time reaches the available time to print.