A Further Analogy

Let’s now look at generative design through the lens of something most of us do on a daily basis: finding the quickest commute route to work.

In this example, let's say you’re looking to go from Brooklyn to Manhattan. You go to your favorite route-comparison website and ask it to find you the quickest route between these two locations.

Above: The Citymapper website showing possible routes between Brooklyn and Manhattan, while also considering multiple modes of transportation.

To help illustrate this analogy, let's make a table comparing the expected activities when searching for the quickest commute route and what their equivalent would be in a generative design process.

Map activity	Equivalent in generative design process

Person (you) sets first parameter: go from Brooklyn to Manhattan	Stage: generate Step: set generation parameters

Computer generates possible routes from Brooklyn to Manhattan, taking into consideration all the available transportation modes, their operating status and set routes	Stage: generate Step: run generation algorithm

Person sets goals: quickest route	Stage: rank Step: define ranking objectives

Computer evaluates each of the identified routes based on your goals	Stage: rank Step: run ranking

Computer attempts to solve your goals and returns the list of routes, putting most suitable ones first	Stage: evolve Step: run evolution

Person evaluates the list of best options and makes a choice more efficiently than if they had to do it themselves	Stage: explore Step: evaluate options

Person chooses preferred route and sends travel instructions to their phone	Stage: integrate Step: integrate preferred option

It's important to note that, because the computer knows about multiple modes of transport (walk, cycle, bus, train, etc.), it can combine them to find the best option. This means the goal we set the computer can have a big effect on the routes that are generated.

For example, if we specified that we wanted to travel by car, or that we needed step-free access, the resulting routes would be completely different.

Above: Citymapper website showing routes that have step-free access.

In this example, we can see that the generated routes take longer than in the first example, as the new goal is to have 'step-free access' instead of 'quickest commute'.

Though this example may be stretching the imagination (as a computer doesn't generate new transport modes, it just generates new routes using existing modes), this analogy demonstrates similar steps as those found in a generative design workflow.