1. Lesson objectives
Know: That computers are more suited to some tasks than others
Understand: That computers affect the way people work and the jobs they do
Be able to: Explain why using a computer to control the environment in a greenhouse would be preferable than relying on a human.

2. Computers or people?

3. Task 1 Controlling systems
Requires a great deal of training and skill
Needs to be able to operate continuously
Requires training and needs worker to be alert for anything else which might be wrong
Needs precision and every single job must be done in the same way
Needs to be able to operate continuously
Continuous, repetitive task
Humans might not be able to judge distance accurately and might make a mistake
Involves observing symptoms and making judgements
Too dangerous for people, risk of explosion

4. Making theme parks look attractive

5. Control Systems
What do plants need to make them grow?
What conditions may change in a greenhouse?

6. Plenary
Does a zebra crossing use control system?
Name another type of road crossing that uses control
What are the differences between a pedestrian and a zebra crossing?

7. Homework task
Use the Internet and do some research on sensors such as temperature, light, humidity. Write a short report explaining what you found out, accompanied by pictures.