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Christopher Douce

Software Engineering Radio: Software engineering processes

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Edited by Christopher Douce, Monday 29 September 2025 at 17:41

Software engineering is about the creation of large software systems, products or solutions in a systematic way with a team of people.

Since software can serve very different needs and has necessarily different requirements, there are a variety of ways that software can be built. These differences relate to the need to take account of different levels of risk. You would use different processes to create a video game, than you would for an engine management system. Software engineering processes are also about making the ‘invisible stuff’ of software visible to software engineers and other stakeholders.

One of the abbreviations that is sometimes used is SDLC, an abbreviation for Software Development Lifecycle. Software has a lifecycle which begins with requirements and ends with maintenance. Although software never wears out, it does age, since the context in which it sits changes. Processes can be applied to manage the stages within and between the software life cycle.

Different terms are used to refer to the development of software systems. There can be greenfield systems, brownfield systems, or legacy systems. Legacy systems can be thought of the ‘old systems that continue to do useful stuff. Legacy systems are also brownfield systems, which software engineers maintain, to make sure they continue to work. Greenfield systems are completely new software products. In the spirit of honesty, more often than not, software engineers will typically be working on brownfield systems and legacy systems than greenfield systems; systems that are towards the end of the software lifecycle than at the start.

The blogs that follow highlight different elements of the software development process. It begins with a discussion about the differences between waterfall and agile. It then goes onto say something about a technique known as Continual Integration/Continual Deployment (CI/CD), which has emerged through the development of cloud computing. CI/CD has been made possible through the development of something called ‘infrastructure as code’, which is worth spending a moment looking at (or listening to). Before we move onto the important subject of software quality, I then share a link to a podcast that discusses a process that aims to enhance quality: code reviews.

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Christopher Douce

Some notes about agile practices in software engineering

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Edited by Christopher Douce, Tuesday 1 April 2025 at 21:06

Software engineering is done by people, but what people do to build software depends on the nature of software that is to be created. The culture of individuals, technologies and organisations also plays an important role too.

At the turn of the century, there was a new idea about how to build software; something called agile development. This led to the creation of something called the Manifesto for Agile Software Development If you’re interested in software development and want to know something about what ‘agile’ means, you need to have a look at the manifesto.

I first learnt about agile through something called eXtreme Programming (Wikipedia), and then something called Scrum (Wikipedia) (Don’t use Wikipedia in your TMAs; always use official references). In my eyes, the notable characteristic about agile (or Agile; there’s a difference between small ‘a’ agile, and large ‘A’ agile) is that it is all about people. Agile (in its different forms) helps to establish rituals which can, in turn, help software engineers to talk about that ‘invisible stuff’ which is software.

I recently asked a colleague, Advait Deshpande, who was the chair of an agile practices microcredential what the latest trends were in agile software development. He was kind enough to share links to some interesting articles and resources.

Articles about agile

 Here are some review articles that might be useful to anyone who is starting to study agile:

Edison, H., Wang, X., & Conboy, K. (2021). Comparing methods for large-scale agile software development: A systematic literature review. IEEE Transactions on Software Engineering, 48(8), 2709-2731. Available at https://ieeexplore.ieee.org/abstract/document/9387593/

Vallon, R., da Silva Estácio, B. J., Prikladnicki, R., & Grechenig, T. (2018). Systematic literature review on agile practices in global software development. Information and Software Technology, 96, 161-180. Available at https://www.sciencedirect.com/science/article/pii/S0950584917302975

Other resources

Advait also shared the following two links, which he gives me permission to share here: UK Government: Agile delivery - Agile tools and techniques.

The notion of ‘agile’ has moved beyond software, but to business. It is important to distinguish between the two. This second link emphasises what agile might mean within a business context: Agile Business Consortium: Business Agility.

Post (or peak) agile

Once, agile was the new thing on the block. Now agile has become mainstream. An accompanying question is: have we reached post (or peak) agile? Also, what comes next? One of the criticisms of agile is that it is best suited to smaller teams, which puts a limit to how it can be applied to bigger projects. There have been several attempts to address this:

Advait directed me to a talk that was hosted on YouTube that had a provocative title:

I know Dave Thomas from a book I have on my shelf at home; a book called ‘the pragmatic programmer’ – it is a good read, and is packed filled with some very practical advice. His talk about agile is worth a watch. He presents a critical view of the ‘agile industry’ in a humorous and engaging way. It is worth a watch. He talks about the origins of the agile manifesto, as well as ‘large agile’. An important point is that when thinking about how to create software, we need to think critically too.

Reflections

When I was learning about software engineering as an undergraduate, I was introduced to something called the software development lifecycle (or SDLC). There are different models; there’s a waterfall model, a spiral model, and there was something called SSADM which bored me to hears. It was only after I graduated that I later learnt about agile in all different guises.

When I started working as a software engineer, the company that I worked for didn’t have a software development process, so we had to make one. Culture and experience are themes that can influence decisions about what is done. I was lucky enough to work with someone who had had a lot of experience, for which I was really thankful for.

We set up policies and processes. We also applied techniques that had an agile flavour, bits of pair programming, and aspects of test driven development. Our processes needed to work for both the products and the people who were developing the software. We needed to be pragmatic to get things done.

Acknowledgements

Thanks are extended to Advait Deshpande. I really appreciated the chat and all the links he shared.

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