‘What Kind of a Problem This is’: Systems Thinking as Pathway to Resilience

Jacobs, quoting the sciences, categorised three problem types: simple, complicated, and complex. 

Simple problems are governed by laws of physical science, manifested as linear trajectories, and are open to cause-effect analyses. If a window doubles in size; the solar energy passing through the opening also doubles. Solar heat gain can be calculated with information on sun angle, sky conditions, glass performance, etc. 

Complicated problems adhere to the same rules of physics, only with more variables. An air conditioning system has mechanical parts, each with a coefficient of performance. This system must cope with multiple variables: solar heat gain, infiltration, and internal heat loads. This is harder to compute, but performance can still be predicted with a high degree of certainty since it is compliant with the laws of thermodynamics. 

A Green building today is understood as the sum total of many simple and complicated problems (envelopes, cooling systems, lights, etc.) wherein each is evaluated, quantified, and optimised separately. The performance of the whole building is the total of its parts. One plus one equals two. 

The making of architecture and cities, however, is neither a simple nor a complicated problem; it falls into the category of complex. Problems of complexity operate with more variables. Add to this the element of human behaviour, and the whole can behave in unpredictable, non-linear ways.

For example, if a building is retrofitted with vegetated walls and rooftop gardens, this would lower the thermal energy passing through the envelope, and reduce the work done by its cooling system. If the development is large and the greenery substantial, the alteration can also impact the microclimate. The behaviour of systems in this case is affected by two feedback loops; one reduces energy demand, and the other, a better microclimate, increases the likelihood of passive comfort that lowers the need for mechanical cooling. If both loops are concurrent, the system as a whole reaches a tipping point, a non-linear drop in energy use. 

To be fair, systems thinking, as an idea, already has currency in design. We use the term system to describe agglomerations of parts brought together to perform a function, say, a building's envelope. There is, however, a difference between this common interpretation and what is discussed in the sciences.

Systems grow, self-organise, and self-repair.3 They are imagined in one way, but can evolve into something altogether different. They have an organic and spontaneous order, wherein “the parts generate the whole . . . while the whole organises the parts”.4 

A complex system, distinct from a simple or complicated one, is impossible to recreate. When a neighbourhood is disbanded, the community that was there loses its system-ness. The new residents will take time to forge relationships and become a new system. 

What does systems thinking mean at the drawing board? 

We start by acknowledging that goals of sustainability and resilience cannot be reached by framing the challenge as many simple nor complicated problems; rather, the situation is essentially complex. A building or neighbourhood comprises multiple systems that combine to form a structure of relations, which is where and how parts talk to each other. Importantly, structure results in patterns of human behaviour and resource use.

When we create structure, we shape patterns. Once we see that some structures create good patterns and others create bad ones, it changes the way we approach design.5 The emphasis shifts from architecture as object making, to creating space as a structure of relations. We recognise the exchanges between systems – e.g. biotic and abiotic elements. This gives us an opportunity to forge a symbiosis between human-made and natural systems. 

Seen in this light, sustainability and resilience are more than the aggregated performance of standalone parts. They emerge from a manipulation of systemic structure, seen as a whole. This making of this structure is, really, form-making. The challenge for architects, in the midst of a climate crisis, is to reclaim the power of form, to see it as something more than a means to an aesthetic end.