Learning Objectives
- Compare robots with human workers in different roles.
- Explain advantages based on repetition, precision, endurance and safety.
- Explain disadvantages based on cost, flexibility, failure and social effects.
- Make a justified recommendation for a robot in a given context.
Key Terms
- Endurance
- The ability to continue operating for long periods without fatigue, subject to power and maintenance.
- Repeatability
- The ability to perform the same programmed movement or sequence consistently.
- Flexibility
- The ability to adapt to different tasks or unexpected conditions.
- Downtime
- The period during which a robot or process cannot operate because of failure or maintenance.
- Human supervision
- Monitoring or control provided by a person.
- Retraining
- Teaching workers new skills for changed technical roles.
- Risk assessment
- Considering possible hazards and the seriousness of their consequences.
Why Robots Are Used
Robots are most useful when a task is repetitive, physically dangerous, requires precise movement or must be performed for long periods. A programmed machine can repeat a defined sequence without fatigue and can place people farther from hazards.
The benefit depends on the task being sufficiently predictable. A robot performs well when sensors can obtain the required data and the program can define suitable responses. Highly variable tasks may still require human judgement and dexterity.
Major Advantages
| Advantage | Explanation |
|---|---|
| Repeatability | The robot repeats the same programmed motion with little variation. |
| Precision | Motors and position feedback can control movement within small tolerances. |
| Endurance | The robot can operate for long periods with breaks mainly for power or maintenance. |
| Safety | The robot can enter hazardous environments or handle dangerous materials. |
| Speed | Programmed movements can be performed quickly and coordinated with other equipment. |
| Remote operation | A person can control equipment from a safer or distant location. |
Major Disadvantages
| Disadvantage | Explanation |
|---|---|
| High cost | Design, purchase, installation, programming and safety equipment are expensive. |
| Maintenance | Mechanical parts, sensors and software require specialist support. |
| Limited adaptability | Unexpected shapes, terrain or behaviour may not match programmed cases. |
| Failure risk | A fault can stop work, damage property or create a safety hazard. |
| Employment effects | Some manual roles may reduce and workers may need retraining. |
| Power dependence | The robot cannot operate normally without a suitable energy supply. |
| Interaction limits | A robot may not provide human judgement, empathy or natural communication. |
Robots Do Not Eliminate Human Roles
People are required to design, program, maintain and supervise robots. Human workers may prepare materials, handle unusual cases and take responsibility for safety. In medicine and transport, human oversight can be especially important because the consequences of failure are serious.
The effect on employment is therefore a change in the type and number of roles rather than a simple claim that all jobs disappear. Some repetitive positions may be reduced, while demand for technical skills increases.
Reliability And Safety
A robot may repeat a wrong action very consistently if its program or sensor data is wrong. Safety depends on accurate sensors, correct programming, reliable actuators and controlled operating areas. Emergency stops, barriers or human supervision may reduce risk, although detailed safety engineering is beyond the syllabus.
A good evaluation explains both probability and consequence. A rare failure may still be important in surgery or transport because the possible harm is severe.
Making A Recommendation
To recommend a robot, identify the main task requirements. If the task is repetitive, dangerous and stable, the robot’s strengths may outweigh its cost. If the environment changes unpredictably and needs judgement or empathy, human performance may remain more suitable.
A combined system is often appropriate: the robot handles routine physical work while a person supervises and deals with exceptions.
Worked Examples
Warehouse Transport Robot
Question: Should a warehouse use robots to move identical containers along fixed routes?
- The task is repetitive and the routes are predictable.
- Robots can operate consistently and reduce manual lifting.
- Costs, maintenance and collision control must be considered.
- Human supervision can handle faults and unusual obstacles.
Answer: Robots are suitable if the workload is large enough to justify the cost and the routes can be operated safely.
Care And Companionship
Question: Why may a robot be less suitable than a person for some care tasks?
- The task may require empathy and interpretation of unusual behaviour.
- A robot follows available data and programmed responses.
- Human communication and judgement may be more appropriate.
Answer: Robots can assist with routine physical tasks, but may not replace human empathy and judgement.
Examination Guidance
- Select advantages that match the task; precision is not the main issue in every robot use.
- Explain how a disadvantage leads to a practical consequence such as downtime, collision or poor interaction.
- Do not write that robots never make mistakes.
- When recommending, compare task predictability, danger, scale and cost.
- Mention a continuing human role where supervision or exceptions matter.
Common Mistakes
- Listing generic points without a scenario.
- Treating repeatability and precision as exactly the same idea.
- Saying robots work forever without power or maintenance.
- Claiming that robots automatically possess AI.
Knowledge Check
1. Why are robots suitable for repetitive tasks?
2. Give one reason robots can improve safety.
3. Why can a robot still make repeated errors?
4. State one continuing human role.
5. When may a human be more suitable?
