The Runtime Theory

topic / modularity-and-boundaries

Modularity and Boundaries

Contain change with cohesive modules and explicit dependencies.

Study coupling, cohesion, dependency direction, data ownership, composition roots, adapters, and the maintenance cost of abstractions.

1 article · 1 video · 1 trace · 1 request flow · 1 interview · 5 total

Articles

modularity and boundariesSep 25, 2026

Module Boundaries Should Follow Change

A module groups decisions that are likely to change together and hides details other modules do not need.

Request Flows

request flow · 5 stagesHow Module Boundaries Should Follow Change worksAn interactive concept flow for module boundaries should follow change, from its assumptions through the main operation and boundary checks.

Videos

modularity and boundariesSep 25, 2026

Video lesson: Module Boundaries Should Follow Change

Recording brief and narration plan for a visual lesson on module boundaries should follow change.

Traces

trace 01 · systemTrace: Module Boundaries Should Follow ChangeFollow the key state changes and boundary checks involved in module boundaries should follow change.

Interviews

medium · t2Explain Module Boundaries Should Follow ChangeExplain the model, execution steps, complexity, and limits of module boundaries should follow change.

Explore adjacent

software architecture

New lessons by email

Get new explanations about modularity and boundaries and related systems in your inbox.

One technical dispatch per week. No noise.