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Software engineering is a field within computer science focused on designing, developing, testing, and maintaining of software applications. It involves applying engineering principles and computer programming expertise to develop software systems that meet user needs. [1] [2] [3] [4]
The terms programmer and coder overlap software engineer, but they imply only the construction aspect of typical software engineer workload. [5]
A software engineer applies a software development process, [1] [6] which involves defining, implementing, testing, managing, and maintaining software systems and, creating and modifying the development process.
Beginning in the 1960s, software engineering was recognized as a separate field of engineering.
The development of software engineering was seen as a struggle. Problems included software that was over budget, exceeded deadlines, required extensive debugging and maintenance, and unsuccessfully met the needs of consumers or was never even completed.
In 1968, NATO held the first software engineering conference where issues related to software were addressed. Guidelines and best practices for the development of software were established. [7]
The origins of the term software engineering have been attributed to various sources. The term appeared in a list of services offered by companies in the June 1965 issue of "Computers and Automation" [8] and was used more formally in the August 1966 issue of Communications of the ACM (Volume 9, number 8) in "President's Letter to the ACM Membership" by Anthony A. Oettinger. [9] [10] It is also associated with the title of a NATO conference in 1968 by Professor Friedrich L. Bauer. [11] Margaret Hamilton described the discipline of "software engineering" during the Apollo missions to give what they were doing legitimacy. [12] At the time there was perceived to be a "software crisis". [13] [14] [15] The 40th International Conference on Software Engineering (ICSE 2018) celebrates 50 years of "Software Engineering" with the Plenary Sessions' keynotes of Frederick Brooks [16] and Margaret Hamilton. [17]
In 1984, the Software Engineering Institute (SEI) was established as a federally funded research and development center headquartered on the campus of Carnegie Mellon University in Pittsburgh, Pennsylvania, United States. [18] Watts Humphrey founded the SEI Software Process Program, aimed at understanding and managing the software engineering process. [18] The Process Maturity Levels introduced became the Capability Maturity Model Integration for Development (CMMI-DEV), which defined how the US Government evaluates the abilities of a software development team.
Modern, generally accepted best-practices for software engineering have been collected by the ISO/IEC JTC 1/SC 7 subcommittee and published as the Software Engineering Body of Knowledge (SWEBOK). [6] Software engineering is considered one of the major computing disciplines. [19]
Notable definitions of software engineering include:
The term has also been used less formally:
Margaret Hamilton promoted the term "software engineering" during her work on the Apollo program. The term "engineering" was used to acknowledge that the work should be taken just as seriously as other contributions toward the advancement of technology. Hamilton details her use of the term:
When I first came up with the term, no one had heard of it before, at least in our world. It was an ongoing joke for a long time. They liked to kid me about my radical ideas. It was a memorable day when one of the most respected hardware gurus explained to everyone in a meeting that he agreed with me that the process of building software should also be considered an engineering discipline, just like with hardware. Not because of his acceptance of the new "term" per se, but because we had earned his and the acceptance of the others in the room as being in an engineering field in its own right. [29]
Individual commentators have disagreed sharply on how to define software engineering or its legitimacy as an engineering discipline. David Parnas has said that software engineering is, in fact, a form of engineering. [30] [31] Steve McConnell has said that it is not, but that it should be. [32] Donald Knuth has said that programming is an art and a science. [33] Edsger W. Dijkstra claimed that the terms software engineering and software engineer have been misused in the United States. [34]
Requirements engineering is about elicitation, analysis, specification, and validation of requirements for software. Software requirements can be functional, non-functional or domain.
Functional requirements describe expected behaviors (i.e. outputs). Non-functional requirements specify issues like portability, security, maintainability, reliability, scalability, performance, reusability, and flexibility. They are classified into the following types: interface constraints, performance constraints (such as response time, security, storage space, etc.), operating constraints, life cycle constraints (maintainability, portability, etc.), and economic constraints. Knowledge of how the system or software works is needed when it comes to specifying non-functional requirements. Domain requirements have to do with the characteristic of a certain category or domain of projects. [35]
Software design is the process of making high-level plans for the software. Design is sometimes divided into levels:
Software construction typically involves programming (a.k.a. coding), unit testing, integration testing, and debugging so as to implement the design. [1] [6] “Software testing is related to, but different from, ... debugging”. [6] Testing during this phase is generally performed by the programmer and with the purpose to verify that the code behaves as designed and to know when the code is ready for the next level of testing.[ citation needed ]
Software testing is an empirical, technical investigation conducted to provide stakeholders with information about the quality of the software under test. [1] [6]
When described separately from construction, testing typically is performed by test engineers or quality assurance instead of the programmers who wrote it. It is performed at the system level and is considered an aspect of software quality.
Program analysis is the process of analyzing computer programs with respect to an aspect such as performance, robustness, and security.
Software maintenance refers to supporting the software after release. It may include but is not limited to: error correction, optimization, deletion of unused and discarded features, and enhancement of existing features. [1] [6]
Usually, maintenance takes up 40% to 80% of project cost. [37]
The examples and perspective in this article may not represent a worldwide view of the subject.(November 2010) |
Knowledge of computer programming is a prerequisite for becoming a software engineer. In 2004, the IEEE Computer Society produced the SWEBOK, which has been published as ISO/IEC Technical Report 1979:2005, describing the body of knowledge that they recommend to be mastered by a graduate software engineer with four years of experience. [38] Many software engineers enter the profession by obtaining a university degree or training at a vocational school. One standard international curriculum for undergraduate software engineering degrees was defined by the Joint Task Force on Computing Curricula of the IEEE Computer Society and the Association for Computing Machinery, and updated in 2014. [19] A number of universities have Software Engineering degree programs; as of 2010 [update] , there were 244 Campus Bachelor of Software Engineering programs, 70 Online programs, 230 Masters-level programs, 41 Doctorate-level programs, and 69 Certificate-level programs in the United States.
In addition to university education, many companies sponsor internships for students wishing to pursue careers in information technology. These internships can introduce the student to real-world tasks that typical software engineers encounter every day. Similar experience can be gained through military service in software engineering.
Half of all practitioners today have degrees in computer science, information systems, or information technology.[ citation needed ] A small but growing number of practitioners have software engineering degrees. In 1987, the Department of Computing at Imperial College London introduced the first three-year software engineering bachelor's degree in the world; in the following year, the University of Sheffield established a similar program. [39] In 1996, the Rochester Institute of Technology established the first software engineering bachelor's degree program in the United States; however, it did not obtain ABET accreditation until 2003, the same year as Rice University, Clarkson University, Milwaukee School of Engineering, and Mississippi State University. [40] In 1997, PSG College of Technology in Coimbatore, India was the first to start a five-year integrated Master of Science degree in Software Engineering.[ citation needed ]
Since then, software engineering undergraduate degrees have been established at many universities. A standard international curriculum for undergraduate software engineering degrees, SE2004, was defined by a steering committee between 2001 and 2004 with funding from the Association for Computing Machinery and the IEEE Computer Society. As of 2004 [update] , about 50 universities in the U.S. offer software engineering degrees, which teach both computer science and engineering principles and practices. The first software engineering master's degree was established at Seattle University in 1979. Since then, graduate software engineering degrees have been made available from many more universities. Likewise in Canada, the Canadian Engineering Accreditation Board (CEAB) of the Canadian Council of Professional Engineers has recognized several software engineering programs.
In 1998, the US Naval Postgraduate School (NPS) established the first doctorate program in Software Engineering in the world.[ citation needed ] Additionally, many online advanced degrees in Software Engineering have appeared such as the Master of Science in Software Engineering (MSE) degree offered through the Computer Science and Engineering Department at California State University, Fullerton. Steve McConnell opines that because most universities teach computer science rather than software engineering, there is a shortage of true software engineers. [41] ETS (École de technologie supérieure) University and UQAM (Université du Québec à Montréal) were mandated by IEEE to develop the Software Engineering Body of Knowledge (SWEBOK), which has become an ISO standard describing the body of knowledge covered by a software engineer. [6]
Legal requirements for the licensing or certification of professional software engineers vary around the world. In the UK, there is no licensing or legal requirement to assume or use the job title Software Engineer. In some areas of Canada, such as Alberta, British Columbia, Ontario, [42] and Quebec, software engineers can hold the Professional Engineer (P.Eng) designation and/or the Information Systems Professional (I.S.P.) designation. In Europe, Software Engineers can obtain the European Engineer (EUR ING) professional title. Software Engineers can also become professionally qualified as a Chartered Engineer through the British Computer Society.
In the United States, the NCEES began offering a Professional Engineer exam for Software Engineering in 2013, thereby allowing Software Engineers to be licensed and recognized. [43] NCEES ended the exam after April 2019 due to lack of participation. [44] Mandatory licensing is currently still largely debated, and perceived as controversial. [45] [46]
The IEEE Computer Society and the ACM, the two main US-based professional organizations of software engineering, publish guides to the profession of software engineering. The IEEE's Guide to the Software Engineering Body of Knowledge – 2004 Version, or SWEBOK, defines the field and describes the knowledge the IEEE expects a practicing software engineer to have. The most current version is SWEBOK v4. [6] The IEEE also promulgates a "Software Engineering Code of Ethics". [47]
The examples and perspective in this United States may not represent a worldwide view of the subject.(September 2021) |
There are an estimated 26.9 million professional software engineers in the world as of 2022, up from 21 million in 2016. [48] [49]
Many software engineers work as employees or contractors. Software engineers work with businesses, government agencies (civilian or military), and non-profit organizations. Some software engineers work for themselves as freelancers. Some organizations have specialists to perform each of the tasks in the software development process. Other organizations require software engineers to do many or all of them. In large projects, people may specialize in only one role. In small projects, people may fill several or all roles at the same time. Many companies hire interns, often university or college students during a summer break, or externships. Specializations include analysts, architects, developers, testers, technical support, middleware analysts, project managers, software product managers, educators, and researchers.
Most software engineers and programmers work 40 hours a week, but about 15 percent of software engineers and 11 percent of programmers worked more than 50 hours a week in 2008. [50] Potential injuries in these occupations are possible because like other workers who spend long periods sitting in front of a computer terminal typing at a keyboard, engineers and programmers are susceptible to eyestrain, back discomfort, Thrombosis, Obesity, and hand and wrist problems such as carpal tunnel syndrome. [51]
The U. S. Bureau of Labor Statistics (BLS) counted 1,365,500 software developers holding jobs in the U.S. in 2018. [52] Due to its relative newness as a field of study, formal education in software engineering is often taught as part of a computer science curriculum, and many software engineers hold computer science degrees. [53] The BLS estimates from 2023 to 2033 that computer software engineering would increase by 17%. [54] This is down from the 2022 to 2032 BLS estimate of 25% for software engineering. [54] [55] And, is further down from their 30% 2010 to 2020 BLS estimate. [56] Due to this trend, job growth may not be as fast as during the last decade, as jobs that would have gone to computer software engineers in the United States would instead be outsourced to computer software engineers in countries such as India and other foreign countries. [57] [50] In addition, the BLS Job Outlook for Computer Programmers, the U.S. Bureau of Labor Statistics (BLS) Occupational Outlook predicts a decline of -7 percent from 2016 to 2026, a further decline of -9 percent from 2019 to 2029, a decline of -10 percent from 2021 to 2031. [57] and then a decline of -11 percent from 2022 to 2032. [57] Since computer programming can be done from anywhere in the world, companies sometimes hire programmers in countries where wages are lower. [57] [58] [59] Furthermore, the ratio of women in many software fields has also been declining over the years as compared to other engineering fields. [60] Then there is the additional concern that recent advances in Artificial Intelligence might impact the demand for future generations of Software Engineers. [61] [62] [63] [64] [65] [66] [67] However, this trend may change or slow in the future as many current software engineers in the U.S. market flee the profession or age out of the market in the next few decades. [57]
The Software Engineering Institute offers certifications on specific topics like security, process improvement and software architecture. [68] IBM, Microsoft and other companies also sponsor their own certification examinations. Many IT certification programs are oriented toward specific technologies, and managed by the vendors of these technologies. [69] These certification programs are tailored to the institutions that would employ people who use these technologies.
Broader certification of general software engineering skills is available through various professional societies. As of 2006 [update] , the IEEE had certified over 575 software professionals as a Certified Software Development Professional (CSDP). [70] In 2008 they added an entry-level certification known as the Certified Software Development Associate (CSDA). [71] The ACM had a professional certification program in the early 1980s,[ citation needed ] which was discontinued due to lack of interest. The ACM and the IEEE Computer Society together examined the possibility of licensing of software engineers as Professional Engineers in the 1990s, but eventually decided that such licensing was inappropriate for the professional industrial practice of software engineering. [45] John C. Knight and Nancy G. Leveson presented a more balanced analysis of the licensing issue in 2002. [46]
In the U.K. the British Computer Society has developed a legally recognized professional certification called Chartered IT Professional (CITP), available to fully qualified members (MBCS). Software engineers may be eligible for membership of the British Computer Society or Institution of Engineering and Technology and so qualify to be considered for Chartered Engineer status through either of those institutions. In Canada the Canadian Information Processing Society has developed a legally recognized professional certification called Information Systems Professional (ISP). [72] In Ontario, Canada, Software Engineers who graduate from a Canadian Engineering Accreditation Board (CEAB) accredited program, successfully complete PEO's (Professional Engineers Ontario) Professional Practice Examination (PPE) and have at least 48 months of acceptable engineering experience are eligible to be licensed through the Professional Engineers Ontario and can become Professional Engineers P.Eng. [73] The PEO does not recognize any online or distance education however; and does not consider Computer Science programs to be equivalent to software engineering programs despite the tremendous overlap between the two. This has sparked controversy and a certification war. It has also held the number of P.Eng holders for the profession exceptionally low. The vast majority of working professionals in the field hold a degree in CS, not SE. Given the difficult certification path for holders of non-SE degrees, most never bother to pursue the license.
The initial impact of outsourcing, and the relatively lower cost of international human resources in developing third world countries led to a massive migration of software development activities from corporations in North America and Europe to India and later: China, Russia, and other developing countries. This approach had some flaws, mainly the distance / time zone difference that prevented human interaction between clients and developers and the massive job transfer. This had a negative impact on many aspects of the software engineering profession. For example, some students in the developed world avoid education related to software engineering because of the fear of offshore outsourcing (importing software products or services from other countries) and of being displaced by foreign visa workers. [74] Although statistics do not currently show a threat to software engineering itself; a related career, computer programming does appear to have been affected. [75] Nevertheless, the ability to smartly leverage offshore and near-shore resources via the follow-the-sun workflow has improved the overall operational capability of many organizations. [76] When North Americans leave work, Asians are just arriving to work. When Asians are leaving work, Europeans arrive to work. This provides a continuous ability to have human oversight on business-critical processes 24 hours per day, without paying overtime compensation or disrupting a key human resource, sleep patterns.
While global outsourcing has several advantages, global – and generally distributed – development can run into serious difficulties resulting from the distance between developers. This is due to the key elements of this type of distance that have been identified as geographical, temporal, cultural and communication (that includes the use of different languages and dialects of English in different locations). [77] Research has been carried out in the area of global software development over the last 15 years and an extensive body of relevant work published that highlights the benefits and problems associated with the complex activity. As with other aspects of software engineering research is ongoing in this and related areas.
There are various prizes in the field of software engineering:
Some call for licensing, certification and codified bodies of knowledge as mechanisms for spreading the engineering knowledge and maturing the field. [81]
Some claim that the concept of software engineering is so new that it is rarely understood, and it is widely misinterpreted, including in software engineering textbooks, papers, and among the communities of programmers and crafters. [82]
Some claim that a core issue with software engineering is that its approaches are not empirical enough because a real-world validation of approaches is usually absent, or very limited and hence software engineering is often misinterpreted as feasible only in a "theoretical environment." [82]
Edsger Dijkstra, a founder of many of the concepts in software development today, rejected the idea of "software engineering" up until his death in 2002, arguing that those terms were poor analogies for what he called the "radical novelty" of computer science:
A number of these phenomena have been bundled under the name "Software Engineering". As economics is known as "The Miserable Science", software engineering should be known as "The Doomed Discipline", doomed because it cannot even approach its goal since its goal is self-contradictory. Software engineering, of course, presents itself as another worthy cause, but that is eyewash: if you carefully read its literature and analyse what its devotees actually do, you will discover that software engineering has accepted as its charter "How to program if you cannot." [83]
Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes, and the development of both hardware and software. Computing has scientific, engineering, mathematical, technological, and social aspects. Major computing disciplines include computer engineering, computer science, cybersecurity, data science, information systems, information technology, and software engineering.
A programmer, computer programmer or coder is an author of computer source code – someone with skill in computer programming.
The Software Engineering Body of Knowledge refers to the collective knowledge, skills, techniques, methodologies, best practices, and experiences accumulated within the field of software engineering over time. A baseline for this body of knowledge is presented in the Guide to the Software Engineering Body of Knowledge, also known as the SWEBOK Guide, an ISO/IEC standard originally recognized as ISO/IEC TR 19759:2005 and later revised by ISO/IEC TR 19759:2015. The SWEBOK Guide serves as a compendium and guide to the body of knowledge that has been developing and evolving over the past decades.
Computer engineering is a branch of electrical engineering that integrates several fields of electrical engineering, electronics engineering and computer science required to develop computer hardware and software. Computer engineering is referred to as Electrical and Computer engineering OR Computer Science and Engineering at some universities
The following outline is provided as an overview of and topical guide to software engineering:
Software engineering professionalism is a movement to make software engineering a profession, with aspects such as degree and certification programs, professional associations, professional ethics, and government licensing. The field is a licensed discipline in Texas in the United States, Engineers Australia(Course Accreditation since 2001, not Licensing), and many provinces in Davao.
The following outline is provided as an overview of and topical guide to human–computer interaction:
Gerard J. Holzmann is a Dutch-American computer scientist and researcher at Bell Labs and NASA, best known as the developer of the SPIN model checker.
Harlan D. Mills was professor of computer science at the Florida Institute of Technology and founder of Software Engineering Technology, Inc. of Vero Beach, Florida. Mills' contributions to software engineering have had a profound and enduring effect on education and industrial practice. Since earning his Ph.D. in Mathematics at Iowa State University in 1952, Mills led a distinguished career.
Certified Software Development Professional (CSDP) is a vendor-neutral professional certification in software engineering developed by the IEEE Computer Society for experienced software engineering professionals. This certification was offered globally since 2001 through Dec. 2014.
End-user development (EUD) or end-user programming (EUP) refers to activities and tools that allow end-users – people who are not professional software developers – to program computers. People who are not professional developers can use EUD tools to create or modify software artifacts and complex data objects without significant knowledge of a programming language. In 2005 it was estimated that by 2012 there would be more than 55 million end-user developers in the United States, compared with fewer than 3 million professional programmers. Various EUD approaches exist, and it is an active research topic within the field of computer science and human-computer interaction. Examples include natural language programming, spreadsheets, scripting languages, visual programming, trigger-action programming and programming by example.
The following outline is provided as an overview of and topical guide to information technology:
Mary Shaw is an American software engineer, and the Alan J. Perlis Professor of Computer Science in the School of Computer Science at Carnegie Mellon University, known for her work in the field of software architecture.
Elaine Jessica Weyuker is an ACM Fellow, an IEEE Fellow, and an AT&T Fellow at Bell Labs for research in software metrics and testing as well as elected to the National Academy of Engineering. She is the author of over 130 papers in journals and refereed conference proceedings.
Carlo Ghezzi is an emeritus professor and former chair of software engineering at the Politecnico di Milano, Italy, and an adjunct professor at the Università della Svizzera italiana (USI), Switzerland. At the Politecnico, he has been the Rector's Delegate for research, department chair, head of the PhD program, and member of the academic senate and of the board of governors of Politecnico.
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This article gives an overview of professional ethics as applied to computer programming and software development, in particular the ethical guidelines that developers are expected to follow and apply when writing programming code, and when they are part of a programmer-customer or employee-employer relationship. These rules shape and differentiate good practices and attitudes from the wrong ones when creating software or when making decisions on a crucial or delicate issue regarding a programming project. They are also the basis for ethical decision-making skills in the conduct of professional work.
Alexander L. Wolf is an American computer scientist known for his research in software engineering, distributed systems, and computer networking. He is credited, along with his collaborators, with introducing the modern study of software architecture, content-based publish/subscribe messaging, content-based networking, automated process discovery, and the software deployment lifecycle. Wolf's 1985 Ph.D. dissertation developed language features for expressing a module's import/export specifications and the notion of multiple interfaces for a type, both of which are now common in modern computer programming languages.
Tore Dybå is a Norwegian scientist and software engineer in the fields of information systems and computer science. He has been a Chief Scientist at SINTEF ICT since 2003.
Laurie Williams is an American software engineer known for her writings on pair programming and agile software development. She is a distinguished professor of computer science at North Carolina State University, and interim head of the Department of Computer Science at North Carolina State University.
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: CS1 maint: url-status (link)The idea for the first NATO Software Engineering Conference, and in particular that of adopting the then practically unknown term "software engineering" as its (deliberately provocative) title, I believe came originally from Professor Fritz Bauer.
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: CS1 maint: numeric names: authors list (link)(1) The institute was competitively awarded to Carnegie Mellon in December 1984 by the US Department of Defense (DoD) to improve the state of the practice of software engineering. ... (2) the SEI moves mature solutions of proven value into widespread use; examples include the Capability Maturity Model (CMM) ...
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: CS1 maint: multiple names: authors list (link)Software engineering is an engineering discipline that is concerned with all aspects of software production from the early stages of system specification to maintaining the system after it has gone into use. In this definition, there are two key phrases:
1. Engineering discipline Engineers make things work. They apply theories, methods and tools where these are appropriate [. . .] Engineers also recognize that they must work to organizational and financial constraints. [. . .]
2. All aspects of software production Software engineering is not just concerned with the technical processes of software development but also with activities such as software project management and with the development of tools, methods and theories to support software production.
We propose that "software engineering" encompasses not just the act of writing code, but all of the tools and processes an organization uses to build and maintain that code over time. What practices can a software organization introduce that will best keep its code valuable over the long term? How can engineers make a codebase more sustainable and the software engineering discipline itself more rigorous?
We believe that software engineering can only advance as an engineering discipline by moving away from its current dependence upon advocacy and analysis, ...
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: CS1 maint: location missing publisher (link)When the term was coined in 1968 by F.L. Bauer of the Technological University of Munich, I welcomed it. [. . .] I interpreted the introduction of the term "software engineering" as an apt reflection of the fact that the design of software systems was an activity par excellence for the mathematical engineer. [. . .]. As soon the term arrived in the USA, it was relieved of all its technical content. It had to be so for in its original meaning it was totally unacceptable [. . .] In the meantime, software engineering has become an almost empty term, as was nicely demonstrated by Data General who overnight promoted all its programmers to the exalted rank of "software engineer"!
The total volume of cited literature is intended to be suitable for mastery through the completion of an undergraduate education plus four years of experience.
After the panels' recommendations were submitted, ACM Council concluded that the framework of a licensed professional engineer, originally developed for civil engineers, does not match the professional industrial practice of software engineering and would preclude many of the most qualified software engineers from becoming licensed.
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