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The Modular Maturity Index (MMI) — associated with Dr. Carola Lilienthal — provides a structured way to assess “modularity” based on observable criteria rather than gut feel. It makes architectural quality visible through measurable signals such as coupling, cohesion, dependency structures, and change dynamics, and turns the findings into actionable improvem…
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The Modular Maturity Index assesses how well a software architecture is divided into clear, changeable, and maintainable modules.
The index was developed as a practical architecture metric to make modularity and technical debt visible together. O'Reilly describes it as a metric that makes module boundaries and dependencies useful for maturity decisions.
Judge a building by its apartments: clear entrances, few shared walls, and separate utilities make renovation easier. Many openings and hidden connections reduce modularity.
A module groups functions that belong closely together.
Dependencies show how strongly changes cross module boundaries.
Metrics make architecture quality comparable and observable over time.
The index supports architecture decisions and refactoring when teams use measurements as a discussion aid alongside engineering judgment.
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