Which term refers to the effort a programmer should take to make source code easy to read and easy to understand?

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The idea here is programming style—the set of conventions and practices a programmer follows to keep code readable and understandable. Programming style includes naming conventions, consistent indentation, clear structure, modular design, and meaningful comments that explain intent rather than restating what the code does. When you apply good programming style, you make the code easier to read, reason about, and maintain, which is exactly how readability is achieved. Readability, meanwhile, is the quality of being easy to read; it’s the outcome of applying a good style, not the practice itself. Spiral Development is a lifecycle model about risk-driven iteration, and Input Protection concerns handling user input securely, so they don’t address how code should be written for readability.