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Software engineering is an engineering approach on a software development of systematic application. A software engineer is a person who applies the principles of software engineering to design, develop, maintain, test, and evaluate computer software. The term programmer is sometimes used as a synonym, but may also lack connotations of engineering education or skills.
Engineering techniques are used to inform [ clarification needed ] the software development process [1] [4] which involves the definition, implementation, assessment, measurement, management, change, and improvement of the software life cycle process itself. It heavily uses software configuration management [1] [4] which is about systematically controlling changes to the configuration, and maintaining the integrity and traceability of the configuration and code throughout the system life cycle.
Modern processes use software versioning. Beginning in the s, software engineering was seen as its own type of engineering. Additionally, the development of software engineering was seen as a struggle. It was difficult to keep up with the hardware which caused many problems for software engineers. Problems included software that was over budget, exceeded deadlines, required extensive de-bugging and maintenance, and unsuccessfully met the needs of consumers or was never even completed.
In 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. The origins of the term "software engineering" have been attributed to various sources. Bauer , the first conference on software engineering. 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.
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.
Dijkstra claimed that the terms software engineering and software engineer have been misused [ improper synthesis? Requirements engineering is about the elicitation, analysis, specification, and validation of requirements for software.
Software requirements can be of three different types. There are functional requirements , non-functional requirements , and domain requirements. The operation of the software should be performed and the proper output should be expected for the user to use.
Non-functional requirements deal with issues like portability, security, maintainability, reliability, scalability, performance, reusability, and flexibility. They are classified into the following types: interference constraints, performance constraints such as response time, security, storage space, etc.
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. Software design is about the process of defining the architecture, components, interfaces, and other characteristics of a system or component. This is also called software architecture. Software design is divided into three different levels of design.
The three levels are interface design , architectural design , and detailed design. Interface design is the interaction between a system and its environment. This happens at a high level of abstraction along with the inner workings of the system. Architectural design has to do with the major components of a system and their responsibilities, properties, interfaces, and their relationships and interactions that occur between them. Detailed design is the internal elements of all the major system components, their properties, relationships, processing, and usually their algorithms and the data structures.
Software construction, the main activity of software development, [1] [4] is the combination of programming , unit testing , integration testing , and debugging.
Testing during this phase is generally performed by the programmer while the software is under construction, to verify what was just written and decide when the code is ready to be sent to the next step. Software testing [1] [4] is an empirical, technical investigation conducted to provide stakeholders with information about the quality of the product or service under test, with different approaches such as unit testing and integration testing.
It is one aspect of software quality. As a separate phase in software development, it is typically performed by quality assurance staff or a developer other than the one who wrote the code.
Software maintenance [1] [4] refers to the activities required to provide cost-effective support after shipping the software product. Software maintenance is modifying and updating software applications after distribution to correct faults and to improve its performance. Software has a lot to do with the real world and when the real world changes, software maintenance is required. Software maintenance includes: error correction , optimization, deletion of unused and discarded features, and enhancement of features that already exist.
Knowledge of computer programming is a prerequisite for becoming a software engineer. 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 interesting 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.
In , the Department of Computing at Imperial College London introduced the first three-year software engineering Bachelor's degree in the UK and the world; in the following year, the University of Sheffield established a similar program. Since then, software engineering undergraduate degrees have been established at many universities. A standard international curriculum for undergraduate software engineering degrees, SE , was defined by a steering committee between and with funding from the Association for Computing Machinery and the IEEE Computer Society.
As of [update] , in the U. The first software engineering Master's degree was established at Seattle University in Since then graduate software engineering degrees have been made available from many more universities. Steve McConnell opines that because most universities teach computer science rather than software engineering, there is a shortage of true software engineers. 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. The U. 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 , 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 The Software Engineering Institute offers certifications on specific topics like security , process improvement and software architecture. Many IT certification programs are oriented toward specific technologies, and managed by the vendors of these technologies.
Broader certification of general software engineering skills is available through various professional societies. The ACM examined the possibility of professional certification of software engineers in the late s, but eventually decided that such certification was inappropriate for the professional industrial practice of software engineering.
In the U. Software engineers may be eligible for membership of the Institution of Engineering and Technology and so qualify for Chartered Engineer status. 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 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.
When Asians are leaving work, Europeans are arriving 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. As with other aspects of software engineering research is ongoing in this and related areas.
There are several prizes in the field of software engineering: [70]. Software engineering sees its practitioners as individuals who follow well-defined engineering approaches to problem-solving.
These approaches are specified in various software engineering books and research papers, always with the connotations of predictability, precision, mitigated risk and professionalism.
This perspective has led to calls [ by whom? Software engineering extends engineering and draws on the engineering model, i. The concept 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.
Engineering
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