Systems Life Cycle Design

Updated: Sep 8

System life-cycle, in systems engineering and design, is a view of a system or proposed system that addresses all phases of its existence to include system conception, design and development, production and/or construction, distribution, operation, maintenance and support, retirement and phase-out.[1] Complex systems are inherently dynamic systems, meaning they are continuously changing over time. Biological systems are a good example of this. The only time they are not engaged in some process of development is when they cease to exist. This is in strong contrast to linear systems that inherently gravitate towards some equilibrium state where they will remain static unless perturbed by some external force. Designing for these dynamic complex systems requires a holistic approach that looks across the system’s life-cycle.


Linear Systems

Linear systems theory is the backbone to modern science and engineering that has created our industrial economies. Within this paradigm, technologies are designed to operate at some kind of normal static equilibrium within a well-known and predefined environment. Their life-cycle is a linear one where the system is created, put into its operating environment where it is designed to function within some normal set of parameters, at a stable and static equilibrium. It is, most importantly, designed to resist change and to maintain operations within these parameters for as long as possible, before being disposed of. This model works well for simple linear systems like bridges where when we clamp our girders together, we want our bolts to stay there. We don’t want them to answer back, to change or grow in any way.

Nonlinear Systems

In complex systems, we are not dealing with bolts. We are dealing with components that have some degree of autonomy and capacity for adaptation. People, businesses, stock prices, web applications, smartphones – these things have their own internal logic through which they adapt to changes within their local environment. Sometimes this logic is very simple, such as some financial algorithm that will automatically sell or buy a stock at a certain price. Or sometimes it is very complex, such as why a person buys a particular item of fashion over another. The net result though is that the system can change and is not determined to follow a linear life-cycle from cradle to grave. It can learn, grow and adapt in response to internal and external conditions in order to renew itself, that is, to become more or less sustainable and thus alter its life-cycle.

Life-Cycle Example

Most businesses don’t last very long, less than a few decades. There are many reasons why this might be, but one model to capture the underlying dynamic of how a business evolves is called the explore and exploit algorithm. In its early years, a business may explore many different products or services, being able to pivot, remain flexible and diversified. But as the business developed, there will be a few products that prove most lucrative, and the business may likely scale them up, becoming centered around them and developing a more formal structured management system as they leverage economies of scale. The result of exploiting a few lucrative products will be that the company will become more profitable, but it has also self-organized into a more critical state. Some small change in the market that moves against the business’ core product might destroy the enterprise. We can then take an example of a business that has designed an alternative course of development for itself. Google has, since its inception, generated over 90% of its revenue from its one core service of web search. So why does it develop and maintain a whole suite of products that generate relatively little revenue? One theory is that Google knows that in a rapidly evolving market it needs to be where the next great thing is going to happen, whether it is in social media or video sharing. By creating this diversity, by continuing to invest resources gained from exploiting its core service into exploring and generating variety, it is able to better evolve and ensure its sustainability.

Evolution

Because markets change, climate changes – everything changes – to design sustainable systems is to design systems that build change and evolution into their structure. To better understand this process of evolution, let’s break it down to see how it works. There are just a handful of key components. We need to be able to create some variety, allow for adaptation and perform selection to see which of the elements are the most adaptable to the particular environment. Firstly, in the production of variation, the system has to create many diverse types. In biological systems, this is done by the mixing and deformation of genes. In the formal world of product development, this typically happens in R&D labs, but when we harness the power of co-creation we have a new resource for mixing and remixing to create endless diversity. Secondly, adaptation. These diverse types are put into operation to interact and adapt to the environment. This requires that we give the elements the space or autonomy required for them to be able to interact and adapt, under their own logic, to their own local environment. Lastly, selection. A process of selection is performed on the elements in order to select the so-called “fittest,” that is, the most suited to that particular environment. In design, this means building feedback loops such as user rating systems so as to determine which products or services are truly functioning best for the end-user.

Systems Life-Cycle

Thus, there are two different models to the design of a system’s life-cycle. At one end of the spectrum, we have our traditional linear systems that will likely be easier and quicker to design, requiring less of an investment and often operating more efficiently in the short-run. But they will be subject to a linear decaying life-cycle as they try to externalize change. At the other end of the spectrum, we have evolutionary systems that internalize change, harnessing the mechanism of evolution to maintain a sustainable, cyclical life-cycle for an indefinite period of time. Complex systems operate in a constant state of change, whether we are talking about social networks, airports or emerging economies. To be able to change as fast as change itself means internalizing this through the integration of evolutionary mechanisms into the platforms that we are building. Evolution is not a mystical process that only happens in natural environments. It is a key feature of dynamic systems, whether we are aware of it or not. But by being conscious of it, one can harness it in our design to create systems with sustainable and cyclical life-cycle.


1. Wikiwand. (2020). Systems development life cycle | Wikiwand. [online] Available at: https://www.wikiwand.com/en/Systems_development_life_cycle [Accessed 8 Sep. 2020].

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