Expert system

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. Which statement describes an expert system?

A An AI system that can give expert advice on any subject without being given rules

B An AI system that uses the knowledge and rules of human experts to give advice on one subject

2. An expert system is built to work in...

A one specialist subject, such as medical diagnosis

B every subject at once, like a general knowledge quiz

3. What is the job of an expert system?

A To stand in for a human expert when one is not available

B To replace the user's need to answer any questions

4. How does an expert system find out about the user's problem?

A It asks the user questions

B It reads the user's mind

5. What does an expert system give back to the user at the end?

A A new set of rules it wrote for the user

B A conclusion or advice

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1expert system		AAn expert system works on one specialist subject only. It cannot be an expert in every subject at once.
2ask_user("Do you have a fever?")		Bprint("Advice: see a doctor")
3An expert system stands in for a human expert by giving advice on one specialist subject, such as medicine		Csubject = "medical diagnosis"
4After the user answers its questions, an expert system gives a conclusion or advice		DThe expert system asks the user a question to collect the facts it needs
5subject = "all subjects"		EThe expert system gives the advice or conclusion using expert knowledge and rules. The user does not guess it.
6expert = "user guesses the advice"		FAn AI system that uses the knowledge and rules of human experts to give advice or answers on one specialist subject

Definitions

expert system

Fill in the Blanks

Complete each line of code by filling in the missing parts.

OUTPUT "Is the leaf yellow?" _____ leaf

IF leaf = "yes" ____ OUTPUT "Add more water" ENDIF

IF fever = "yes" THEN OUTPUT "See a doctor" _____

IF temp _ 38 THEN OUTPUT "Fever" ENDIF

IF rash = "yes" ___ fever = "yes" THEN OUTPUT "Advice: see a doctor" ENDIF

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A OUTPUT "Do you have a fever?"

B INPUT temp

C IF fever = "yes" THEN

D OUTPUT "See a doctor"

E ENDIF

Question 2

A OUTPUT "Is the leaf yellow?"

B INPUT yellow

C IF yellow = "yes"

D OUTPUT "Lacks iron"

E ENDIF

Question 3

A subject ← "All subjects"

B OUTPUT "Does it start?"

C INPUT starts

Question 4

A INPUT age

B IF age > 18 THEN

C OUTPUT "Ask a parent first"

D ELSE

E OUTPUT "You can sign"

F ENDIF

Question 5

A INPUT rain

B IF rain ← "yes" THEN

C OUTPUT "Take an umbrella"

D ENDIF

Answer Key

Expert system

Section A: Quick Questions

B — An AI system that uses the knowledge and rules of human experts to give advice on one subject

A — one specialist subject, such as medical diagnosis

A — To stand in for a human expert when one is not available

A — It asks the user questions

B — A conclusion or advice

Section B: Match the Pairs

expert system → An AI system that uses the knowledge and rules of human experts to give advice or answers on one specialist subject

ask_user("Do you have a fever?") → The expert system asks the user a question to collect the facts it needs

An expert system stands in for a human expert by giving advice on one specialist subject, such as medicine → subject = "medical diagnosis"

After the user answers its questions, an expert system gives a conclusion or advice → print("Advice: see a doctor")

subject = "all subjects" → An expert system works on one specialist subject only. It cannot be an expert in every subject at once.

expert = "user guesses the advice" → The expert system gives the advice or conclusion using expert knowledge and rules. The user does not guess it.

Section C: Definitions

expert system — An AI system that uses the knowledge and rules of human experts to give advice or answers on one specialist subject. It asks the user questions and gives a conclusion.

Section D: Fill in the Blanks

OUTPUT "Is the leaf yellow?"
INPUT leaf

IF leaf = "yes" THEN
    OUTPUT "Add more water"
ENDIF

IF fever = "yes" THEN
    OUTPUT "See a doctor"
ENDIF

IF temp > 38 THEN
    OUTPUT "Fever"
ENDIF

IF rash = "yes" AND fever = "yes" THEN
    OUTPUT "Advice: see a doctor"
ENDIF

Section E: Spot the Error

B — The expert system stores the user's answer in a variable and then tests it. The answer was stored in temp, but the IF rule tests fever. Line 2 should be INPUT fever.

C — An IF rule needs THEN after its condition. Line 3 should be IF yellow = "yes" THEN.

A — An expert system covers one specialist subject, such as car repair. It cannot be an expert in all subjects. Line 1 should name one subject: subject ← "Car repair".

B — The rule gives the 'ask a parent' advice to users under 18. The comparison is the wrong way round, so adults would be told to ask a parent. It should be IF age < 18 THEN.

B — A rule compares the user's answer with a value, so it uses = and not the assignment arrow ←. Line 2 should be IF rain = "yes" THEN.