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What is software engineering

Dubois Sébastien

Sébastien Dubois /

4 min read

In this article, I'll share my personal take on the difference between software development and software engineering (SE). It is a personal opinion, so take it with a grain of salt.

This content is part of my Dev Concepts series of books.

Software development

So what is it about?

Many people may tell you that both terms refer to the same concept. Personally, I don't agree. The way I see things, software development is the "what" (i.e., the activity) and software engineering is broader; it corresponds to the "what" and the "how" (i.e., the process, the approaches, the methodologies, etc).

I like the definition of the IEEE standards body:

Software engineering is the application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software; that is, the application of engineering to software.

IEEE 610.12-1990

To create software, we perform various activities, and how we approach those activities has a huge impact on the results and on the overall quality. Writing code is only a part of the story. There are many more activities around coding. For instance, before coding, we need to understand user needs (i.e., their requirements). Then, we need to clarify the business rules (e.g., is X accepted or not, when, how, why), the workflows (e.g., what happens before/after X), the data models (i.e., what concepts/data will the application manipulate), the data flows, etc. Still before coding, we also need to architect and design the solution so that it is built on solid grounds.

The coding part itself is also critical of course, and there are many dimensions/things to take care of. Security is also something of the utmost importance. Finally, once code has been written for an application, it needs to be built, tested/validated, released, deployed, monitored, maintained, etc. My Dev Concepts series of books as a whole discusses those topics.

Luckily, there's actually a generally accepted standard defining a set of phases for software development projects. It is called the Software/System Development Life Cycle (SDLC). Personally, I think that all software developers should clearly understand the SDLC and apply it in their projects, whether big or small.

Next to the software development phases, there are other things to consider like the software development approaches/methodologies (e.g., Agile, XP, etc) and project management techniques (e.g., PMBOK), which greatly impact the way we work, and collaborate with each other.

To finish this short post, I'll leave you with a wonderful quote from Margaret Hamilton, one of the pioneers of software engineering:

Software during the early days of this project was treated like a stepchild and not taken as seriously as other engineering disciplines, such as hardware engineering; and it was regarded as an art and as magic, not a science. I had always believed that both art and science were involved in its creation, but at that time most thought otherwise. Knowing this, I fought to bring the software legitimacy so that it (and those building it) would be given its due respect and thus I began to use the term “software engineering” to distinguish it from hardware and other kinds of engineering; yet, treat each type of engineering as part of the overall systems engineering process. When I first started using this phrase, it was considered to be quite amusing. It was an ongoing joke for a long time. They liked to kid me about my radical ideas. Software eventually and necessarily gained the same respect as any other discipline.

Margaret Hamilton, Lead software engineer of the Apollo Project



In this short article, I've introduced the notion of software engineering. It's just an idea, a simple concept. And that's the magic; if you learn the concepts one by one, then you'll quickly become one of us, a software crafter. It's not that hard; it's like everything, it just takes time.

That’s it for today!

About Sébastien

Hello everyone! I'm Sébastien Dubois. I'm an author, founder, and CTO. I write books and articles about programming (TypeScript, Web, React, Angular, NestJS, etc), personal knowledge management, personal organization, and productivity.

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