A proper job shop scheduling software has numerous advantages which improve the overall efficiency of a job shop. Still, some high-mix low-volume (HMLV) manufacturers might not be fully convinced that their own job shop actually belongs to those needing a more advanced job shop scheduling tool. One might find its own production too small to justify an investment into a software. Hence, despite the possibility of using a proper scheduling software, many small make-to-order manufacturers still rely on their old scheduling tools: paper, whiteboards or most commonly Excel. This posts first reflects on those simple production scheduling tools and then shares 3 signs that your shop needs proper job shop scheduling.