computer science

Maintainability

Maintainability is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Maintainability rather than just read about it. In short: Maintainability is the inherent design characteristic of a system or product that determines the probability that it can be retained in, or restored to, a specified operating condition within a given time when maintenance is performed under prescribed conditions using specified procedures and resources. Usage in different fields Engineering In engineering, maintainability is the ease with which a product can be main…

Key takeaways

Maintainability belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Maintainability to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Maintainability from memory before moving on to harder problems.

Reference excerpt

Maintainability is the inherent design characteristic of a system or product that determines the probability that it can be retained in, or restored to, a specified operating condition within a given time when maintenance is performed under prescribed conditions using specified procedures and resources.

Usage in different fields

Engineering In engineering, maintainability is the ease with which a product can be maintained to:

correct defects or their cause, Repair or replace faulty or worn-out components without having to replace still working parts, prevent unexpected working conditions, maximize a product's useful life, maximize efficiency, reliability, and safety, meet new requirements, make future maintenance easier, or cope with a changing environment. In some cases, maintainability involves a system of continuous improvement - learning from the past to improve the ability to maintain systems, or improve the reliability of systems based on maintenance experience.

Telecommunication In telecommunications and several other engineering fields, the term maintainability has the following meanings:

A characteristic of design and installation, expressed as the probability that an item will be retained in or restored to a specified condition within a given period of time, when the maintenance is performed by prescribed procedures and resources. The ease with which maintenance of a functional unit can be performed by prescribed requirements. This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).

Software

In software engineering, these activities are known as software maintenance (cf. ISO/IEC 25010). Closely related concepts in the software engineering domain are evolvability, modifiability, technical debt, and code smells.

See also List of system quality attributes, non-functional requirements for system evaluation Maintenance (technical), measures to preserve or restore the functionality or lifespan of equipment and infrastructure Supportability (disambiguation) Serviceability (disambiguation) Software sizing, activity in software development to estimate the size of a component, such as the number of lines of code or functions (not taking into account the effort required) Reliability, availability, maintainability and safety, characterization of a product or system Throw-away society, human society strongly influenced by consumerism

References

Further reading Blanchard, Benjamin S.; Verma, Dinesh C.; Peterson, Elmer L. (1995). Maintainability: A Key to Effective Serviceability and Maintenance Management. Wiley. ISBN 978-0-471-59132-0. Ebeling, Charles E. (2019). An Introduction to Reliability and Maintainability Engineering (3rd ed.). Waveland Press. ISBN 978-1-4786-3933-6. Patton, Joseph D. (2005). Maintainability & Maintenance Management (4th ed.). Patton Consultants. ISBN 978-1-55617-944-0.

External links "Calculation, Field testing and history of Maintainability Index (MI) (with references)". Virtual Machinery. Archived from the original on 2012-01-20. "Measurement of Maintainability Index (MI)". Verifysoft Technology GmbH. Archived from the original on 2011-06-23.* Foreman, John T.; Gross, Jon; Rosenstein, Robert; Fisher, David; Brune, Kimberly (January 1997). "Maintainability Index Technique for Measuring Program Maintainability". C4 Software Technology Reference Guide: A Prototype (PDF). Software Engineering Institute. p. 231. CMU/SEI-97-HB-001. Archived (PDF) from the original on 2022-10-09.

Illustrations

Worked examples

Example 1 — a first encounter with Maintainability

Start with the simplest possible case. Write down what Maintainability claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Maintainability before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Maintainability ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Maintainability

In research: Maintainability appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Maintainability in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Maintainability is common in secondary-school and first-year university syllabi. It links to neighbouring topics Design for X, Maintenance, Software quality, so understanding it makes those chapters shorter.
In everyday life: Look for Maintainability outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Maintainability in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Maintainability means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Maintainability out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Maintainability in simple terms?

Why does Maintainability matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Maintainability?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Maintainability.