Defensible by designDecisions remain reviewable and evidenced.
Transparent processScope, ownership and boundaries stay visible.
Client-first partnershipWork starts with the operating need.
Secure by defaultAccess and sensitive data stay controlled.
Beyond ZeroEngineering curriculum preview15–20 minute preview

C++ Beyond Zero · Lesson 04 of 14

Interfaces, Composition, and Dependency Inversion

Understand where Interfaces, Composition, and Dependency Inversion fits in a maintainable, testable, and reviewable engineering workflow.

Curriculum preview for chapter 4 of C++ Beyond Zero. It positions Interfaces, Composition, and Dependency Inversion inside the larger pathway from architecture and verification to secure delivery and operations.

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Why this matters

Understand the consequence before the technique.

Interfaces, Composition, and Dependency Inversion affects more than implementation detail. It changes how the system can be reviewed, changed, secured, released, and operated by someone other than the original author.

Key questions

  • What engineering decision is hidden inside interfaces, composition, and dependency inversion?
  • Which assumptions, failure modes, and boundaries must be recorded?
  • What evidence would let another reviewer verify the result?

Lesson outline

Four stages from recognition to action.

  1. 01

    Frame the decision

    Identify the requirement, trade-off, or failure mode behind interfaces, composition, and dependency inversion.

  2. 02

    Define the boundary

    Separate stable domain behaviour from framework, transport, storage, or platform concerns.

  3. 03

    Verify the behaviour

    Choose tests, measurements, and review evidence that match the actual risk.

  4. 04

    Plan delivery and operation

    Record deployment, diagnostics, limitations, recovery, and the next review point.

Practice prompt

Turn recognition into a repeatable response.

Write a one-page decision record for Interfaces, Composition, and Dependency Inversion. Include the context, chosen boundary, rejected alternative, verification evidence, operational signals, and rollback or recovery path.

Use fictional or sanitised information. Do not place private, exploitative, illegal, or identifying material into a public worksheet or shared example.

Related topic hubs

See the lesson inside a wider skill or safety system.

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