Which JIT concept produces only the quantities needed by the next workstation and no more?

Heijunka refers to production leveling and is aimed at smoothing out production schedules to reduce variability and maintain a steady workflow. While it helps manage demand and improve efficiency, it does not specifically dictate that only the quantities needed by the next workstation are produced, as this is a broader concept focused on balancing workloads.

A push system relies on forecasts and predetermined schedules to produce goods, meaning that items are manufactured in advance of actual demand. This often leads to excess inventory and waste, directly contradicting the principle of producing only what is needed by the next workstation, which is a hallmark of lean manufacturing practices.

A safety-stock system involves maintaining extra inventory to mitigate risks of stockouts and variability in demand. While safety stock can be beneficial for ensuring availability, it does not align with the pull principle, which emphasizes producing only what is needed and avoiding excess inventory at any stage of the process.