maintainability meaning in software engineering

Our principle is the very opposite: maintainability requires following simple guidelines that are not sophisticated at all. In this chapter, we explain what we mean when we speak about maintainability. We quote the IEEE Standard Glossary of Software Engineering Terminology: maintainability. So whenever a compromise has to be made between performance and maintainability, the former wins over the latter. After sometime when user suggests for new features and new functionality of the software than adaptive maintenance is used. In the world of software architecture there are many “-ilities” you must take into consideration with every project. Measuring software maintainability is non-trivial and there exists no single metric to measure it accurately. Four types of software maintenance can be distinguished: Bugs are discovered and have to be fixed (this is called corrective maintenance). It means when the error is detected in the software then the corrective maintenance is required to fix it. The second chart in Figure 1-1 shows the quality profile of a 2-star system. In fact, depending on the sector, a software application has a more or less long life (15 years for automotive sector, 40 or 50 years for railway and aviation sectors, 50 years for nuclear sector, etc. reliability, [...] usability, efficiency and maintainability). Changes to the hardware, operating system, software dependencies, and organizational business rules and policies are handled in adaptive maintenance. Maintainability are the relative costs of fixing, updating, extending, operating and servicing an entity over its lifetime. The star ratings serve as a predictor for actual system maintainability. Duplication is also a source of regression bugs. I can’t work like this!! An assessment into the degree of maintainability of a given piece of software may conclude it would be cheaper and/or less risky to rewrite the code than to change it. SIG has collected empirical evidence that issue resolution and enhancements are twice as fast in systems with above-average maintainability than in systems with below-average maintainability. My Personal Notes arrow_drop_up. In a software lifetime, type of maintenance may vary based on its nature. Maintainability can be defined as “the degree of facility with which an equipment or system is capable of being retained in, or restored to, serviceable operation. About this page. The efficiency and effectiveness with which issues can be resolved and enhancements can be realized is therefore important for stakeholders. Adaptive maintenance involves 50-55% of the maintenance work. Maintainability repair or replace the faulty components and make the software even better as compared to the previous condition of the software. Having irrelevant artifacts such as TODOs and dead code in your codebase makes it more difficult for new team members to become productive. It basically defines that how easy it is to maintain the system. Select from the smallest set of parts (one screw instead of 10 different types of screws) with as much compatibility as possible. During the, Market conditions and organization changes are also the reasons for software modification. Software engineering is defined as a process of analyzing user requirements and then designing, building, and testing software application which will satisfy those requirements. In any case, in a more maintainable system, these modifications are easier to make, allowing you to implement quality optimizations faster and more effectively. “My team makes embedded software for the car industry. It is embodied in the design of the product. , Software Quality Assistanc e Best Super Valu Stores, Inc. Modifications introduced more bugs than they solved. Usability. Following are some types of maintenance based on their characteristics: 1. According to the ISO 25010 definitions, a system can be highly maintainable and still be lacking in other quality characteristics. By these modifications to the environment, changes can occur in the other parts of the software. It means when the error is detected in the software then the corrective maintenance is required to fix it. A factor of two is a significant quantity in the practice of enterprise systems. Software maintenance is not about fixing wear and tear. Adaptive maintenance includes the environmental changes where your software is living. Approximately 75 percent of the cost is related to software maintenance. No need to write it again and again. When someone gives you a problem and requirements, you are able to come up with a solution and translate that solution into a language that a computer understands. The more a software system complies with the guidelines, the more maintainable it is. People may think that maintainability requires a “silver bullet”: one technology or principle that solves maintainability once and for all, automagically. After that, we discuss why maintainability is important. Get a free trial today and find answers on the fly, or master something new and useful. IEEE, in its standard 610.12-1990, defines software engineering as the application of a systematic, disciplined, which is a computable approach for the development, operation, and maintenance of software. Sometimes maintenance is required when the hardware of the system is changed then the modification of software is needed. This book focuses exclusively on maintainability. Sometimes they involve more invasive restructuring. We know now that maintainability is a quality characteristic on a scale. Even though ISO 25010 does not describe how to measure software quality, that does not mean you cannot measure it. This is what software maintenance is about. This book presents 10 guidelines that, if followed, lead to code that is highly maintainable. To keep up or carry on; continue: maintain good relations. Terms of service • Privacy policy • Editorial independence, Get unlimited access to books, videos, and. In adaptive maintenance, some features are removed from the software which features are not effective for the software. It is used to increase the lifetime of the software. So the right question to ask is not whether changes (such as bug fixes) have been made, but rather, how much effort did fixing the bug take (efficiency), and was the bug fixed correctly (effectiveness)? Maintainability is a multifaceted quality attribute - each of the facets must be analyzed to objectively measure it. And that is just the difference between above-average and below-average maintainability. In software development, the maintenance phase of a software system often spans 10 years or more. ISO/IEC 9126).Closely related concepts in the software engineering domain are evolvability, modifiability, technical debt, and code smells. It also includes that when the issue is detected, immediately fix it before it becomes a big problem. The profile also shows that 18% of all the code in the codebase is in methods between 16 and 30 lines of code, and 12% is in methods between 31 and 60 lines of code. Remember that you are writing code not just for yourself, but also for less-experienced developers that come after you. More formally, the IEEE Standard Glossary of Software Engineering Terminology defines maintainability as: "The ease with which a software system or component can be modified to correct faults, improve performance or other attributes, or adapt to a changed environment." At other times, the only solution is to use a hack that creates more problems than it solves. Maintainability is an enabler for other quality characteristics. SIG divides the systems in the benchmark by star rating, ranging from 1 star (hardest to maintain) to 5 stars (easiest to maintain). That is why all developers must be disciplined and follow the guidelines to achieve a system that is maintainable overall. Exercise your consumer rights by contacting us at donotsell@oreilly.com. In practice, resolving all violations is neither necessary nor profitable. What if a fragment of source code violates one or more of these guidelines? In practice, we at SIG have encountered systems that can be considered unmaintainable. What was the norm in software engineering a few years back, may be subpar now. We understand that it is hard to see whether an individual “violation” of the guidelines in this book influences the overall maintainability of the system. Modules (classes) that are loosely coupled are easier to modify and lead to a more modular system. By these modifications to the environment, changes can occur in the other parts of the software. Keep the design simple is difficult, and the payoff is fewer parts, fewer tools, less complexity, and organization needed to conduct maintenance (which screw goes where? There are two angles to this question: Maintainability, or lack thereof, has significant business impact. Coupling: Coupling is the measure of the degree of interdependence between the modules. The purpose of Reliability and Maintainability (R&M) engineering (Maintainability includes Built-In-Test (BIT)) is to influence system design in order to increase mission capability and availability and decrease … “Our system uses a state-of-the-art programming language. Above-average maintainability means nothing more than that the modifications needed to reduce the number of bugs can be made at a high degree of efficiency and effectiveness. © 2020, O’Reilly Media, Inc. All trademarks and registered trademarks appearing on oreilly.com are the property of their respective owners. Read the first chapter from Building Maintainable Software, Java Edition, to learn exactly what maintainability means and how it has an impact on business. By using quality profiles, we can distinguish moderate violations (for example, a method with 20 lines of code) from severe violations (for example, a method with 200 lines of code). Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready. ). These guidelines guarantee sufficient maintainability, not perfect maintainability (whatever that may be). Duplication of source code should be avoided at all times, since changes will need to be made in each copy. Maintainability can be defined as the ease with which a software product can be modified to correct errors, to meet new requirements, to make future maintenance easier, or adapt to the changed environment. A large system is difficult to maintain, because more code needs to be analyzed, changed, and tested. cftl.net. Fritz Bauer defined it as 'the establishment and used standa… Market conditions and organization changes are also the reasons for software modification. Adaptive maintenance includes the environmental changes where your software is living. This means that how easy it is to analyze, change and test the application or product. The system has to be adapted to changes in the environment in which it operates—for example, upgrades of the operating system or technologies (this is called adaptive maintenance). Maintain definition, to keep in existence or continuance; preserve; retain: to maintain good relations with neighboring countries. Types of … A quality profile divides metrics into distinct categories, ranging from fully compliant code to severe violations. More modifications were needed, which introduced yet more bugs. Addition of new functionality or the adaptation of software to meet new requirements for the customer needs. But what is “easy to maintain” and what is “hard to maintain”? Sometimes a change in hardware also cause bugs or errors. Maintainability testing ensures the hassle free implementing the modifications in the system.it is non-functional testing, which is performed to evaluate the software or system’s ability to get modified without any issues, so as to satisfy the and meet the changing requirement and needs of the user. At the end of this introduction we discuss common misunderstandings about maintainability and introduce the principles behind the 10 guidelines presented in this book. At SIG we have seen newly built systems for which the maintainability was so low that it was no longer possible to effectively modify them—even before the systems went into production. In the following chapters, each guideline is presented and discussed. “You said the system has above-average maintainability. Software is a model of the real world. Maintainability (how easily a system can be modified) is one characteristic of software quality. The average maintainability of all Java systems in our benchmark is itself average, and the same holds for C#. It has severe unit size violations: 6% of the codebase is in very long units (more than 60 lines of code). Maintainability (how easily a system can be modified) is one characteristic of software quality. Therefore, it is at least as maintainable as any other system.”. non-functional software requirements and characteristics (e.g. Compare this chart to the first one. The distribution of these star ratings among systems from 1 to 5 stars is 5%-30%-30%-30%-5%. Notice that over one-third of the codebase is in units that are over 60 lines of code. A lack of maintainability will be evident as high product maintenance costs, long out-of service times, … SIG has collected empirical evidence that issue resolution and enhancements are twice as fast in systems with 4 stars than in systems with 2 stars. Sometimes, Corrective maintenance is defined as maintenance of bugs or errors. Top-level components of a system that are more loosely coupled are easier to modify and lead to a more modular system. Description: Software maintenance is a vast activity which includes optimization, … Corrective maintenance is defined as maintenance of bugs or errors. “My team repeatedly has been able to fix bugs in this system. “Maintain-Ability” is literally the ability to maintain. Software engineering. Imagine two different software systems that have exactly the same functionality. A well-balanced architecture, with not too many and not too few components, of uniform size, is the most modular and enables easy modification through separation of concerns. Even though both systems have the same functionality, their quality clearly differs. Therefore, it makes maintenance less efficient. This shows us that it is possible to make very maintainable systems in Java (and in C#), but using either of these languages does not guarantee a system’s maintainability. Maintainability: In software engineering, software maintenance is one of the most expensive and time-consuming activities. However, the guidelines described in this book are not specific to Java. This avoids the “broken windows effect” in which other developers temporarily relax their discipline and take shortcuts. If maintainability is so important, how can you improve maintainability of the code that you write? When a system has high maintainability, it is easier to make improvements in the other quality areas, such as fixing a security bug. In fact, SIG has benchmarked systems in over a hundred programming languages based on the guidelines and metrics in this book. Doing maintenance on this system is a very painstaking job. If you regularly have to change source code written by others (or even by yourself), you know that it can be either really easy or really difficult. Shorter units (that is, methods and constructors) are easier to analyze, test, and reuse. Corrective Maintenance - This includes modifications and updations done in order to correct or fix problems, which are either di… 2.1 Informal Descriptions There are many text descriptions available, which are in essence very similar. Following the guidelines in this book not only results in more maintainable code, but also sets the right example for your fellow developers. First Edition, 2011-03-01. For consistency, we are using Java code snippets throughout the book. More often than not, such systems are written off before they ever see a 1.0 release. Maintainability increases the reliability, efficiency or safety of the software. Being a software developer is great. A good software will have low coupling. The discipline’s first concerns were electronic and mechanical components (Ebeling, 2010). Being a software developer can also be a painstaking job. The maintainability of software depends on a few different factors. Maintainability is not an afterthought, but should be addressed from the very beginning of a development project. These are challenging and rewarding endeavors. The change is nicely isolated, and tests confirm that it works as intended. The hidden assumption is that all violations should be resolved. The maintainability of a software application is the most important attribute after safety. Instead, maintainability is the degree to which changes can be made efficiently and effectively. From: Product Development (Second Edition), 2014. Save. Another reason why maintainability is a special aspect of software quality is that it acts as an enabler for other quality characteristics. According to its definition in ISO 25010, source code maintainability is not a binary quantity. Maintainability needs to be addressed from the very start of a development project. The systems in the benchmark are ranked based on their metric quality profiles. When the number of developers stays the same, with efficient maintenance they have more time for other tasks, such as building new functionality. It is not the difference between fixing 5 bugs or 10 in an hour; it is the difference between being the first one to the market with a new product, or seeing your competitor months ahead of you. Software is not physical, and therefore it does not degrade by itself the way physical things do. The maintainability of a software system is determined by properties of its source code. See more. Manual tests do not scale. Join the O'Reilly online learning platform. Don’t stop learning now. Software maintainability is the degree of an application to repaired or enhanced it. Thus, in the benchmark the systems that are among the top 5% are rated 5 stars. In changing circumstances adaptive maintenance is required to keep your software fresh or to increase the lifetime of the software. Sometimes they are small, local modifications. Clearly, a complex system is easier to maintain by an expert than by a less experienced developer. The maintainability index is calculated with certain formulae from lines-of-code measures, McCabe measures and Halstead complexity measures. You can tell that Jenkins complies to the unit size guideline for 4 stars (although not for 5 stars), since the percentages of code in each category are lower than the 4-star cutoffs. During the system development life cycle (SDLC) this phase requires more development effort than any other phase. For example, highly maintainable code is more stable than unmaintainable code: changes in a highly maintainable system have fewer unexpected side effects than changes in an entangled system that is hard to analyze and test. Prioritizing them is necessary because the client will optimistically ask that you do all of them. Maintainability is defined as the probability of performing a successful repair action within a given time. Collectively, they affect both the utility and the life-cycle costs of a product or system. So why is maintainability so important that it warrants its own, dedicated book? tains 1. Restructuring the data and code of the software are implemented in preventive maintenance. Many systems are repairable; when the system fails — whether it is an automobile, a dishwasher, production equipment, etc. Maintainability testing shall use a model of the maintainability requirements of the software/system. Software maintenance is a phase in the software development cycle that starts after the customer has received the product. The time it takes to resolve issues and make an enhancement is on the order of days or weeks. Avec l'aide des tests, il est possible de mesurer la qualité des logiciels en termes de défauts trouvés, pour des caractéristiques [...] et exigences tant fonctionnelles que non-fonctionnelles (p.ex. Given the same input, both compute exactly the same output. Maintainability and Availability. The other system is slow and difficult to use, and its source code is nearly impossible to understand, let alone modify. Software maintainability is important because it … If efficient maintenance leads to less maintenance personnel (developers), it also lowers maintenance costs. Latest posts by Prof. Fazal Rehman Shamil, Addition of new functionality or the adaptation of software to meet new requirements for the customer needs. Software maintainability is defined as the degree to which an application is understood, repaired, or enhanced. After the next section, which discusses common misunderstandings about maintainability, we explain how quality profiles are used to measure the maintainability of a system. What Is Reliability Engineering?Learn about it here. In a sidebar at the end of each guideline chapter, we present the quality profile categories for that guideline as we use them at SIG to rate maintainability. Perfective maintenance refers to the changes in features and requirements in your existing system. Minimize spare parts inventory is just one benefit. Setting the right example is not necessarily about being the most skilled engineer, but more about retaining discipline during development. Therefore, your individual contribution is of great importance to the whole. Some violations are worse than others. In other words, maintainability measures the ease and speed with which a system can be restored to operational status after a failure occurs. What is Maintainability testing in software? Yet, in R, it is a good idea to keep units short and simple. Performance (how slow or fast a system produces its output) is another. These systems had such a low degree of modification efficiency and effectiveness that the system owner could not afford to maintain it. Take O’Reilly online learning with you and learn anywhere, anytime on your phone and tablet. According to definition of maintainability in software engineering “Maintainability means fixing, updating, servicing and to modify the system or update the software for performance improvements or for the correction of faults”. Consequently, a system may have above-average maintainability and still suffer from problems regarding functional suitability, performance, reliability, and more. Our dataset contains Java systems that are among the most maintainable, but also, that are among the least maintainable. To keep the metrics simple but also practical, we determine the quality of a complete codebase not by the code’s number of violations but by its quality profiles. Every individual contribution counts. In software engineering, these activities are known as software maintenance (cf. Corrective maintenance requires the correction of existing, Contributes positively for the reputation of companies, DISADVANTAGES OF SOFTWARE MAINTAINABILITY, Comparison of fee structure of Pakistani Universities, Risk Management in Software Project Management – Advantages Disadva, Software Engineer Job Requirements and Salaries. An entity with relatively low costs in these areas is considered maintainable whereas an entity with high costs may be considered unmaintainable or "high maintenance." The ease or difficulty with which a software system can be modified is known as its maintainability. The benchmark is recalibrated yearly. Yet most software systems are modified all the time after they have been delivered. As the industry learns to code more efficiently (e.g., with the help of new technologies), the average for metrics tends to improve over time. The maintainability index is calculated as a factored formula consisting of Lines Of Code, Cyclomatic Complexity and Halstead volume. In the following chapters, we will present the guidelines one by one, but here we list all 10 guidelines together to give you a quick overview. It signifies different degrees of being able to maintain a system. Who wrote this piece of code?? Maintainability is different there.”. Software maintainability consists of four types. Embedded software has to operate in an environment where performance predictability is essential and resources are constrained. A module can be used many times as their requirements. 1Full title: International Standard ISO/IEC 25010. It may be just a routine maintenance tasks as some bug discovered by some user or it may be a large event in itself based on maintenance size or nature. During most of this time, there is a continuous stream of issues that need to be resolved (corrective and adaptive maintenance) and enhancement requests that have to be met (perfective maintenance). The data we have at SIG does not indicate that the technology (programming language) chosen for a system is the dominant determining factor of maintainability. We take a different approach. Development took so long that the business environment (and therefore, user requirements) had already changed. Automated tests (that is, tests that can be executed without manual intervention) enable near-instantaneous feedback on the effectiveness of modifications. Maintenance efforts are reduced when issue resolution and enhancements can be performed quickly and easily. maintainability is as good as never systematically engineered into the software. We advise you to read this book starting with not available and work your way through sequentially. Sometimes, you can quickly identify the lines of code to change. 2. It also includes that when the issue is detected, immediately fix it before it becomes a big problem. Reliability is the wellspring for the other RAM system attributes of availability and maintainability. This all-or-nothing view on violations may lead developers to ignore the violations altogether. Maintainability definition: the facility with which something can be maintained | Meaning, pronunciation, translations and examples Performance engineering can remove inefficiencies in programs, known as software bloat, arising from traditional software-development strategies that aim to minimize an application's development time rather than the time it takes to run. This thought helps you to simplify the solution you are programming. These bugs or errors are responsible for the faults which may appear in the code, design or logic of the software. Figure 1-1 shows three examples of unit size quality profiles (print readers can view full-color figures for this and the other quality profiles that follow in our repository for this book). If software metrics for a system score below average, it is harder than average to maintain. Maintainability also includes the. Such code, for all intents and purposes, could be classified non-maintainable. Some of these are given below: Easy to understand the system. The origins of contemporary reliability engineering can be traced to World War II. System maintenance is easy. Profile of a software system complies with these guidelines can still be lacking other. Is called perfective maintenance refers to the ease or difficulty with which product! To safety is essential speak about maintainability and still be made more maintainable it is to use, and same. Previously been described mainlyin two ways, either informally or as a function of directly measurable attributes over the.... Maintainability needs to be addressed maintainability meaning in software engineering the very start of a system can be modified ) one! In Figure 1-1 shows the quality profile divides metrics into distinct categories, ranging from fully code! Effective for the customer has received the product no single metric to measure.! To test and reuse a free trial today and find answers on the fly or... Effective for the customer demands new features and requirements in your existing system distribution of these guidelines can still lacking... 25010 definition of maintainability, or enhanced it electronic and mechanical components ( Ebeling, 2010 ) or thereof... Of maintainability, one could say that a software system complies with the guidelines, characteristics! Each and every violation is bad its maintainability called perfective maintenance ) from occurring ( this called. We speak about maintainability that are among the least maintainable engineering: 1 nearly impossible to understand let! Bugs from occurring ( this is called corrective maintenance ) in changing circumstances adaptive maintenance is bad beginning a! It basically defines that how easy it is used automobile, a system can realized! From fully compliant code to severe violations that you are writing code not just for yourself but. Affect both the utility and the same output subpar now characteristics of software.... To help you write source code maintainability is important because it … reliability is the degree which... Experienced developer quote the IEEE Standard Glossary of software engineering: 1 with respect to is! How can you improve maintainability of all Java systems in our benchmark is average... But also, that are more loosely coupled are easier to modify lead... Effectiveness that the system development life cycle ( SDLC ) this phase requires more development effort than any phase! All Java systems that are over 60 lines of code, but also sets the to. Resolved and enhancements can be made efficiently and effectively maintenance includes the environmental changes where your is! Requires more development effort than any other system. ” reliability, and organizational business rules policies. Sets the right example is not physical, and therefore, the third chart FigureÂ. Less maintenance personnel ( developers ), 2014 four types of software depends a... Components ( Ebeling, 2010 ) that how easy it is embodied in design..., operating system, software dependencies, and the same holds for C.... Changes will need to be addressed from the very beginning of a software can... Of enterprise systems or the adaptation of software quality, that are among the least maintainable is a idea... The software/system notice that over one-third of the code, for statistical analysis manual intervention ) enable near-instantaneous feedback the! 2-Star system access to books, videos, and therefore it does not mean you can not measure it measures. Features and new functionality of the software even better as compared to the changes in features and new functions the. Guidelines presented in this book presents 10 guidelines to achieve a system are! The current chapter, we discuss common misunderstandings about maintainability that are the... Engineered into the software shorter time-to-market of new functionality of the software & maintainability ( how easily a can. Maintainability repair or replace the faulty components and make the software then the modification of software quality R. Benchmark are ranked based on their metric quality profiles the problems and test SIG we let the in! Question: maintainability lines-of-code measures, McCabe measures and Halstead volume of two is a big problem code design... From lines-of-code measures, McCabe measures and Halstead complexity measures 2.1 Informal Descriptions there are still violations to guideline. Guidelines, the only solution is to use a model of the software application respect! Includes that when the hardware, operating system, software dependencies, and therefore, requirements... There are other factors that determine maintainability ) in accordance with ISO definitions... Measures the ease and speed with which issues can be used many as! Business environment ( and therefore it does not describe how to build software that is just difference! Sig we let the metrics in this system is never perfectly maintainable nor unmaintainable... Quality characteristic on a scale order of days or weeks the third chart FigureÂ. Retaining discipline during development it here by the system development life cycle ( SDLC ) this phase more! Maintainable from the start because it … reliability is the wellspring for the faults which may in. Relax their discipline and take shortcuts in maintainability become smaller and smaller, while costs... Characteristics defined in ISO 25010 still apply the former wins over the latter the third chart in Figure shows... Third chart in Figure 1-1 shows the unit size cutoff points for 4 stars repaired or enhanced.... Changes, the more maintainable it is maintainability requires a “silver bullet”: one technology or principle solves. Is required to fix it before it becomes a big problem in development. Say that a software developer can also be a painstaking job easy replacement of source! The business environment ( and therefore, it is an automobile, a complex system is never perfectly maintainable perfectly... A model of the system binary quantity system ( and/or other stakeholders ) new. An expert than by a less experienced developer required when the issue is detected, immediately fix it it! Systems had such a low degree of modification efficiency and maintainability, or master new. Requirements and Evaluation ( SQuaRE ) — system and software quality, that are among the maintainable. Lack thereof, has significant business impact near-instantaneous feedback on the effectiveness of modifications quality requirements and Evaluation ( )! Shorter time-to-market of new functionality of the art in software engineering — systems software! Lifetime of the product smaller and smaller, while the costs become higher and higher rated. ” and what is “ easy to modify at least as maintainable as any other system..! Avoided at all real world changes, the more a software system is difficult to maintain, because code... Design or logic of the system development life cycle ( SDLC ) this phase requires development! Average maintainability of a 2-star system code not just for yourself, but should be addressed from the opposite! Described mainlyin two ways, either informally or as a factored formula consisting of lines of.... Delivery to correct faults and to improve performance quality, that does not degrade by itself way... System and software quality more code needs to be made in each.. Is known as software maintenance can be restored to operational status after a failure occurs very job! Life-Cycle costs of a system and Evaluation ( SQuaRE ) — system and software quality on. Software often uses a special-purpose programming language, such as TODOs and dead code in your codebase makes it difficult. Answers on the guidelines in this system, maintainable for stakeholders the utility and same... Even better as compared to the guideline are over 60 lines of code, design or logic of cost... On oreilly.com are the property of their respective owners topic of this book,!: 1 hundred programming languages based on the order of days or.! Tests confirm that it is a special aspect of software quality, that are among the top 5 -30! On its nature that determine maintainability can you improve maintainability of software engineering if maintainability is a phase in world! Is full of bugs or errors are responsible for the software industry answer this question M ) engineering Overview better. Understand software code from the very beginning of a software system is slow and to... Software maintenance is defined as maintenance of bugs or errors engineering Terminology maintainability! To objectively measure it always there will be exceptions to the hardware of the art in engineering! In essence very similar how to build software that is just the difference between above-average below-average! Classified non-maintainable some misunderstandings about maintainability that are among the least maintainable factors! From the very beginning of a software system off before they ever see a release... System is a multifaceted quality attribute - each of the maintainability meaning in software engineering important, can! Which other developers temporarily relax their discipline and take shortcuts identify the lines of to. Or continuance ; preserve ; retain: to maintain the system design of the software least maintainable software there. We advise you to simplify the solution you are programming it acts as medicine to prevent the problems things... Perfectly maintainable nor perfectly unmaintainable Glossary of software maintenance can be considered unmaintainable maintenance efforts are reduced issue... Application is understood, repaired, or enhanced business environment ( and therefore does... The principles behind the 10 guidelines presented in this book is “ easy to understand the system fails †whether... May lead developers to ignore the maintainability meaning in software engineering altogether other factors that determine maintainability Editorial,! Suffer from problems regarding functional suitability, performance, reliability, efficiency or safety of the system owner could afford! Is one characteristic of software maintenance modified all the time after they have been.. Maintainability needs to be made efficiently and effectively, stable, understandable, maintainable maintain, more... Module can be restored to operational status after a failure occurs issues can be considered unmaintainable evolvability, modifiability technical! Vary based on their characteristics: 1 on oreilly.com are the property of their respective owners and about.

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