Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M1254

Liskov Substitution Principle

Liskov Substitution Principle
SystemsHigh supportSystems Theory
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

Subclasses must be able to replace their base classes without causing errors in the program. That is, subclasses must not change the behavioral contract of the base class.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Maintain contract consistency. If you promise a service (base class), your upgraded version (subclass) must be fully compatible with the old functionality, and must not secretly reduce or change behavior, otherwise it will break user trust (system crash).

anchor

Anchor fast decisions

The Liskov substitution principle requires that subclasses (subtypes) can seamlessly replace their base classes without breaking program correctness, meaning the behavioral contract must be compatible with the base class.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Liskov_substitution_principleZH · Explicit
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