system-design

A deep module in software architecture features a small interface surface backed by a rich implementation, ensuring simple interactions while hiding complex logic to minimize overall system complexity.

Design a modular API with minimal complexity by enforcing deep interfaces and disciplined information hiding, which encapsulates implementation details and reduces cross-module coupling for robust software.

Apply information hiding to reduce cross-module coupling whenever you design reusable libraries or CLIs, encapsulating internal knowledge so that changes in implementation do not ripple through dependent modules.

Yes, you can use these system design principles for CLI and library development, as the approach guides teams through deep module boundaries and strategic trade-offs across APIs, modules, and command-line interfaces.

The best way to minimize complexity when designing reusable software systems is to balance strategic planning with practical trade-offs, focusing on deep modules and reduced surface area based on John Ousterhout's principles.

Deep module design reduces software complexity by hiding intricate implementation details behind small, simple interfaces, preventing internal knowledge from leaking across module boundaries and lowering cross-module coupling.