Urban Design Principles and Theory
This domain tests whether you can justify a physical-form decision with named theory rather than taste. Expect questions that describe a street, square or block and ask which concept, author or intervention applies.
The canonical toolkits
- Kevin Lynch (1960) - paths, edges, districts, nodes, landmarks; the test is legibility (can a stranger build a mental map?) and imageability.
- Jane Jacobs (1961) - four generators of diversity: mixed primary uses, short blocks, aged buildings, sufficient density; plus "eyes on the street".
- Gordon Cullen (1961) - serial vision, enclosure, "here/there"; design is experienced in sequence, not in plan.
- Oscar Newman (1972) - defensible space: territoriality, natural surveillance, image, milieu.
- Jan Gehl - the edge zone and "life between buildings"; activity is the product of physical quality.
- Bill Hillier - space syntax: integration and connectivity predict movement and co-presence.
Worked example
A consultant proposes merging four 90 m blocks into one 400 m superblock to free land for a park. Using Jacobs, longer blocks cut the number of route choices at every corner, thinning pedestrian flow on the residual streets and weakening informal surveillance. Using Lynch, the superblock erases a legible edge and a node at the old crossing. Using Hillier, integration values on the internal cul-de-sac fall sharply, so only residents use it. Conclusion: keep a pedestrian through-route and a public edge, place the park internally but open at one corner - a design that satisfies the brief without destroying permeability.
Traps
- Mixing Lynch's five elements with Cullen's serial vision; both concern perception but answer different questions.
- Treating "imageability" as prettiness rather than navigability.
- Calling any closed courtyard "defensible space" without territorial marking and surveillance.
- Confusing Jacobs' generators of diversity with her conditions for city life.