Explanation:

- Push system: This is not part of the lean system. Lean manufacturing utilizes a pull system, where production is based on customer demand, not forecasts.

- Continuous improvement: Lean focuses on constantly improving processes and eliminating waste.

- There is zero wasting time: Lean aims to eliminate wasteful activities, thereby maximizing productivity.

- There is zero inventory: Lean manufacturing minimizes inventory levels by producing only what is needed at the time.

- There is continuous finding ways of reducing process time: Lean encourages ongoing efforts to streamline processes and reduce time.