Lean manufacturing is a production philosophy originating from the Toyota Production System. Its core goal is to eliminate waste (muda) while maintaining or improving quality and output.
The seven wastes of lean (TIMWOOD):
- Transport — unnecessary movement of materials
- Inventory — excess stock tying up capital
- Motion — unnecessary worker or machine movement
- Waiting — idle time between processes
- Overproduction — making more than needed
- Over-processing — more steps than necessary
- Defects — rework and scrap
Key lean tools:
- Just-in-Time (JIT): Materials arrive exactly when needed, minimising inventory
- Kaizen: Continuous incremental improvement
- Kanban: Visual signals to control production flow
- 5S: Sort, Set in order, Shine, Standardise, Sustain — workplace organisation
Flexible manufacturing systems (FMS) are designed to respond quickly to changes in product type or volume. Machines are reconfigurable; workers are multi-skilled.
Characteristics:
- CNC and robotic cells that can be reprogrammed rapidly
- Multi-skilled workforce able to perform different tasks
- Shorter production runs with quicker changeover
- Enables product variety without major retooling
Responsive manufacturing extends flexibility to market signals — the ability to increase or decrease production volume, introduce new variants, or pivot to new products quickly in response to consumer demand or market changes.
Key enabler: Digital supply chains and real-time demand data
Lean and flexible/responsive manufacturing are complementary, not opposed:
| Aspect | Lean | Flexible/Responsive |
|---|---|---|
| Primary goal | Eliminate waste | Adapt to change |
| Inventory philosophy | Minimise (JIT) | Buffer for responsiveness |
| Workforce | Specialised + multi-skilled | Multi-skilled |
| Production run | Optimised batches | Short, variable runs |
| Technology | Standardised, efficient | Reconfigurable |
Example: A furniture manufacturer using CNC routers (flexible) with Kanban-controlled timber stock (lean) can switch between product lines rapidly while minimising overproduction.
KEY TAKEAWAY: Lean eliminates waste within a production system; flexible/responsive manufacturing enables that system to adapt to demand. Contemporary manufacturers need both.
VCAA FOCUS: Be ready to explain how a specific manufacturing scenario balances lean principles with the need for flexibility. Use real-world examples to support your argument.
