Modern industrial and commercial practice Scales of production — AQA A-Level Design and Technology: Product Design
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Modern industrial and commercial practice Scales of production explained
A unit production system (UPS) moves individual products between workstations rather than passing a continuous flow of identical items along a line.
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Each unit is carried, often on an overhead conveyor or a powered track, from one station to the next, and at each station operatives or machines perform their allotted task before the unit travels on. Because units can be routed and paced individually, UPS suits products made in modest volumes with some variation, such as garments or assembled components, where a rigid flow line would be inflexible. Compare this with flow production, where identical items move continuously along a fixed sequence of stations. In UPS the transport system carries the work to the people; the sequence of operations is organised around the movement of each unit.
Your focus
- Describe how a unit production system moves individual units between workstations.
- Explain why UPS offers flexibility compared with a fixed flow line.
- Distinguish UPS from flow production in terms of how work is moved and sequenced.
Modern industrial and commercial practice Scales of production exam tips
Marking Points
- A unit production system transports individual units between workstations, often using overhead conveyors or powered tracks.
- Each unit is moved from station to station, and at each station a specific task is carried out before it moves on.
- UPS allows individual routing and pacing of units, giving flexibility that a rigid flow line lacks.
- UPS suits moderate-volume production with some product variation, such as garment manufacture or component assembly.
- UPS contrasts with flow production, where identical items pass continuously through a fixed sequence of stations.
Examiner Tips
- 💡Look for the transport mechanism in each option: a system carrying individual units between stations signals UPS.
- 💡Distinguish UPS from flow production by asking whether items are identical and continuous or individual and separately routed.
- 💡Match the production scale to the system: UPS suits moderate volumes with variation, not mass production of identical items.
Common Mistakes
- Defining UPS as one-off or fixed-position production: correct this by recognising UPS transports individual units between workstations rather than keeping the product stationary.
- Describing UPS as a single operator building a whole product: correct this by noting the work is divided across stations and the system moves each unit between them.
- Confusing UPS with flow production: correct this by stating that flow production passes identical items continuously along a fixed line, whereas UPS moves individual units that can be routed and paced separately.