Rules of Thumb

Key Principle

Collected heuristics from across Dark Matter and Trojan Horses -- actionable principles, decision rules, and warnings distilled into a scannable list. These are the operational residue of Hill's argument: what you carry into a room when you cannot carry the whole book.

Why This Matters

Strategic design operates in conditions of uncertainty, institutional complexity, and political constraint. Practitioners need fast heuristics that encode hard-won lessons without requiring full theoretical justification in the moment. These rules of thumb compress the book's argument into decision-ready form.

Good Examples

The heuristics below are drawn from concrete cases in the book -- Low2No (Helsinki), Renew Newcastle, BBC iPlayer, Brisbane floods, the 2011 protest wave -- not from abstract principle. Each earned its place through observed success or failure.

On Problem Definition

The problem is never the problem as presented. "To describe the problem is part of the solution" (Karl Gerstner, 1964, cited in Section 6)
"Technology is the answer. But what is the question?" (Cedric Price, cited in Section 6)
If the problem fits neatly within one department's boundaries, you are solving the wrong problem
"There are no clients for these problems. Who is the client for climate change, except perhaps the entire human race?" (Chapter: What is The Problem?)

On Dark Matter

Every visible artefact is shaped by an invisible substrate of organisation, culture, legislation, finance, and habit -- engage the substrate or your intervention dies as a one-off
"If it's too easy to get an idea accepted, you're probably doing it wrong. You're probably not disturbing the dark matter enough." (Section 8)
The consultant model ensures designers never touch dark matter; embedded positioning is required for systemic impact
Design typically addresses ~5% of a problem space (Papanek); the "real problem" is the remaining 95% (Section 9)

On the Four Plays

Always start with a MacGuffin -- a real project that creates gravitational pull and forces resolution
The MacGuffin is the excuse to be in the room; the Trojan Horse is what you smuggle in while there
Design the Trojan Horse payload before the visible artefact -- know what strategic change you are embedding
Every intervention should be designed as a platform -- if it cannot replicate, it is an installation
"Think of everything as a platform" (Karsten Schmidt, Section 7)
Protect slow layers, experiment on fast layers -- political capital is "predicated on stated guarantees, not 'waiting to see what kind of flavours come out'" (Section 7)

On the Meta-Matter Zoom

Oscillate continuously between strategic context (meta) and tangible artefact (matter)
"Lose track of a building project by focusing on the strategic layer too much, and nothing gets realised. Focus pull on the building layer and all you have is that: a building, with no strategic impact." (Section 7)
Management consultants reach meta but not matter; design consultants reach matter but not meta; only the strategic designer moves between both (Section 9)

On System Resilience

Brittleness is designed-in, not natural -- "Sprawl is an outcome of active policy, of design" (Chapter: What is The Problem?)
Distributed essential services degrade gracefully; centralised ones fail catastrophically (Adrian Lahoud's post-traumatic urbanism, Chapter: What is The Problem?)
"Placing a system in a straitjacket of constancy can cause fragility to evolve" (CS Holling, Section 10)
High baseline systems with low variance need designed-in diversity to survive changed conditions

On Failure and Learning

Distinguish good failure (system learns and adapts) from bad failure (system restores its pre-failure state)
After crisis, move fast -- the window for structural redesign closes before the nostalgic instinct to rebuild identically wins
The snap-back to pre-failure state is the default; learning requires deliberate feedback architecture
"I see the gobsmacking crash and resulting flux as a rare limited-time-only opportunity to significantly update and reform the system." Response: "That didn't happen either." (Kurt Andersen / Dan Hill, Chapter: What is The Problem?)

On Design's Position

Design at the end of the value chain cannot challenge premises -- a middle-manager at the developer has more agency than a Pritzker prize-winning architect hired as consultant (Section 6)
Separating strategy from execution is "deeply flawed -- a narrow, unhelpful concept replete with unintended negative consequences" (Roger Martin, cited in Chapter: What is The Problem?)
"Strategy is enacted through a focus on the quality of execution, rather than an abstract model." (Concluding Chapter)
Prototyping is epistemological, not just implementational -- "Without the designing happening there can be no meaningful observation" (Richard Blythe, Section 6)

On the Social Contract

Social unrest is evidence of design failure in the social contract, not merely a political problem
The unit of redesign is the culture of decision-making itself, not any individual policy or service
Conditions framed as inherent problems (ageing, diversity) may be assets awaiting redesign of the frame
"We need to believe that reorienting our various cultures of decision-making may be the only civilised way forward." (Concluding Chapter)
Systems that appear immutable are in fact "imagined, articulated, and stewarded into position" -- and therefore open to redesign (Section 8)

Counterpoints

These heuristics are drawn primarily from Nordic/European institutional contexts with high state capacity; they may not transfer directly to low-capacity or informal governance settings
The emphasis on embedding within institutions assumes institutions are the right unit of change -- some problems may require building new institutions rather than redesigning existing ones
Several heuristics are in productive tension (e.g., "move fast after crisis" vs. "protect slow layers") -- the practitioner must judge which applies in context

Key Quotes

"Just as we never consider the ground beneath our feet until we trip, these glimpses into the complex webs of inter-dependencies upon which modern life relies only come when part of that web fails." -- David Korowicz, 2011, cited in Chapter: What is The Problem?

"Through the action of designing we come to know the world in ways that we did not know it prior to designing." -- Richard Blythe, cited in Section 6

Related References

social contract - The civic purpose these heuristics serve
The Augmented Nordic Model - The primary context from which many heuristics were derived
Implementation Playbook - The four plays in full operational detail