Key Programming Principles: KISS, DRY, YAGNI and Other Guidelines

Programming principles help developers write maintainable, low‑defect code. The author, a senior architect, presents a curated list of such principles derived from a StackOverflow discussion.

KISS (Keep It Simple Stupid) encourages keeping designs simple and avoiding unnecessary complexity. Originating from Lockheed engineers, it stresses that a system should be easy to understand and repair.

DRY (Don’t Repeat Yourself) advocates eliminating duplicate code, documentation, and effort. It promotes a single authoritative representation for each piece of logic, reducing maintenance overhead and preventing accidental inconsistencies.

YAGNI (You Ain’t Gonna Need It) warns against building features before they are truly required, saving time, money, and future refactoring effort.

Additional advice includes writing code for the maintainer, being as lazy as possible (i.e., reusing existing solutions), and distinguishing cause‑effect in program communication versus factual statements in human interaction.

Further software design guidelines are listed: minimize coupling, maximize cohesion, follow the Open/Closed principle, adhere to Single Responsibility, hide implementation details, and apply the Law of Demeter.

The article concludes with a reminder that code is only a means to solve problems, not the solution itself, and that testing is essential—code that has not been tested is considered broken.