Expert Systems (Cambridge (CIE) IGCSE ICT)

Case Study

Movie recommendation system

Inputs

• Indicate favourite genres/directors

• Rate movies watched (stars/thumbs up, thumbs down etc.)

• Previous movie searches (keywords)

Inference engine

• Matching similar movies to users history (based on director/genre/actor/reviews etc.)

• Filtering movies with similar characteristics as previously watched

• Filtering movies based on what users with similar tastes have watched/liked

Output

• Display a personalised list of movie recommendations

Worked Example

Expert systems are used by doctors.
a. Describe how an expert system can be used to diagnose illnesses.

[5]

b. Name two other applications of expert systems.

[2]

Answers

a. five of:

An Interactive user interface appears [1]
Questions are asked about the illness [1]
Yes and No type answers to the questions [1]
Answers lead to other questions [1]
The inference engine searches the knowledge base [2]
Using the rules base [1]
Probabilities/possibilities of diagnoses and treatments are displayed [1]
Displays the ways it achieved the solutions/conclusions / explanation [1]

b. two of:

Mineral prospecting [1]
Car engine fault diagnosis [1]
Chess games [1]
Tax queries [1]
Careers recommendations [1]
Movie recommendations on streaming platforms [1]