What the KISS principle is
The KISS principle is a design guideline whose name stands for the idea of keeping things simple. It holds that most systems work best when they are kept simple rather than made unnecessarily complex. The principle advises avoiding needless complexity, favoring straightforward solutions. Although it originated more broadly, it is widely applied in software design and engineering.
Valuing simplicity
At its heart, the KISS principle values simplicity. It suggests that, when solving a problem, a simpler solution is usually preferable to a more complicated one, provided it does the job. Simplicity makes things easier to understand, build, and maintain. The principle is a reminder not to add complexity beyond what the problem actually requires.
Why complexity causes problems
Unnecessary complexity can make a system harder to understand, more prone to errors, and more difficult to maintain or change. Complicated solutions can hide bugs and confuse those who work with them. By keeping things simple, the KISS principle aims to avoid these problems, since simpler systems are generally more reliable and easier to reason about.
Keeping solutions simple
Applying the KISS principle means choosing the simplest approach that works and resisting the temptation to over-engineer. It does not mean doing things poorly; rather, it means not making things more complicated than they need to be. A simple, clear solution is often more robust and easier to work with than an elaborate one that solves the problem in a convoluted way.
The principle in practice
In practice, the KISS principle serves as a guiding reminder throughout design and development to favor clarity and simplicity. It complements other guidelines that aim to keep software manageable. Understanding the KISS principle clarifies a widely held value in engineering: that simple solutions tend to be better, and complexity should be added only when truly justified.
Why it matters
The KISS principle is an important guideline in software design. Understanding what it is - keeping systems simple rather than unnecessarily complex - clarifies a core value that leads to more reliable, maintainable software. For anyone building software, it is a valuable concept to understand.
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See also: What is the YAGNI principle? Explained, What is a code smell? Explained.
Sources
Published date reflects the original event date (2026-10-15). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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