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Generalisation

Term Key terms bank Y11 OOP

Definition

Moving the features shared by several classes up into a common superclass (Student and Teacher generalised as Person). The 2025 marker note: refine attributes into separate inherited classes.

Example: Common attributes go in the superclass; unique ones stay in each subclass.

Found in: syllabus, school notes.

Short version to memorise (key terms bank)

Common features pulled up into a superclass.

Where it is used in the test

Syllabus area: Y11 OOP.

Question types it can appear in

Drawing: class diagram (2025 Q22 and sample Q24)
Multiple choice: Pick the option that matches the definition or example.
Short answer: Define, outline or explain it and tie it to the scenario.

Where it has appeared in the paper

The Software Engineering Project (Part A, B). Part letters follow each paper’s own layout.

Study links

Flashcard: Generalisation in The Object-Oriented Paradigm (Year 11) · study that set
Memorise: Object-oriented concepts
Key terms bank entry: Generalisation
Notes: Generalisation and Abstraction (Year 11 content (Programming fundamentals, OOP, Mechatronics))
Notes: Research models used by software engineers to design and analyse ML, including decision… (Software Automation (Year 12))
Notes: Object-oriented concepts (Year 11 content (Programming fundamentals, OOP, Mechatronics))

How to use it in an answer

A model sentence

General advice, built from the definition and example above

“Moving the features shared by several classes up into a common superclass (Student and Teacher generalised as Person).” Then apply it: Common attributes go in the superclass; unique ones stay in each subclass.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

General advice

No linked question shows the command word for this term. Across the past drawing and short answer questions in this bank the words used most are: Explain, Outline, Describe, Compare, Classify, Analyse. Check the actual word in your question.

Technique for the question types

Drawing: Use the online drawing tool: label every symbol and arrow, use the correct symbols from the specification, and add every required item.
Multiple choice: Read all four options, rule out wrong ones, pick one; no penalty for guessing so never leave blank.
Short answer: One clear point per mark, use the stimulus and course terms, and answer the command word.

What the marking guidelines and feedback say

2025 HSC Q22 (3 marks): Modelling tools

Technique: move attributes shared by several classes up into a parent (superclass) and draw an inheritance arrow from each subclass to the parent; leave only unique attributes in subclasses. Marker feedback: refine attributes into separate inherited classes; use appropriate class diagram symbols.

Sample exam Q24 (4 marks): Modelling tools (class diagram)

A reasoned design (NOT the NESA diagram): classes Trip(tripID; assignTicket()), PassengerCar(carModelCode), Engine(engineModelCode), Area(areaType, numSeats) with subclasses Executive (20 seats) and Standard (400 seats), Passenger(email, phone; buyTicket()) with subclass FrequentTraveller(loyalty info), Ticket(ticketType, seatNumber). Relationships: Trip 1 to many PassengerCar; Trip 1 to 1 Engine; Trip 1 to 2 Area; Passenger 1 to 0..* Ticket; Ticket * to 1 Trip. Show multiplicities and inheritance arrows (hollow triangle).

Common mistakes

Marker feedback on other questions of the same type (code and diagram feedback often applies across questions)

Drawing questions (2025 HSC exam Q22): refine attributes into separate inherited classes; use appropriate class diagram symbols.