Chapter 43 Exercises

How to use these exercises: Work through the parts in order. Part A builds recognition skills, Part B develops analysis, Part C applies concepts to your own domain, Part D requires synthesis across multiple ideas, Part E stretches into advanced territory, and Part M provides interleaved practice that mixes skills from all levels.

For self-study, aim to complete at least Parts A and B. For a course, your instructor will assign specific sections. For the Deep Dive path, do everything. This is the final exercise set in the book -- complete as much as you can, and use the capstone essay (Part E) as your culminating work.

Part A: Pattern Recognition

These exercises develop the fundamental skill of recognizing cross-domain transfer opportunities and distinguishing structural from surface analogies.

A1. For each of the following pairs, classify the analogy as (i) structural homology, (ii) functional analogy, (iii) surface resemblance, or (iv) false analogy. Justify your classification using the analogy quality test from Section 43.7.

a) A hospital emergency department and a fire station dispatch center. Both must triage incoming requests, allocate scarce resources under time pressure, and prioritize based on severity.

b) A corporation and a lion pride. Both have a dominant leader, subordinate members, competition for status, and territorial behavior.

c) A highway traffic system and the flow of blood through the circulatory system. Both involve fluid flowing through branching networks, with congestion at bottlenecks and flow rates determined by channel width.

d) A teacher in a classroom and a gardener tending plants. Both nurture growth by providing the right conditions rather than directly causing it.

e) A stock market crash and an earthquake. Both are sudden, violent releases of accumulated stress in a complex system.

f) A software company's codebase and a medieval cathedral. Both are large structures built over many years by many people, with each generation building on and sometimes undermining the work of previous generations.

g) A democracy and a marketplace. Both aggregate distributed preferences into collective outcomes through a mechanism of individual choice.

h) A pandemic spreading through a population and a rumor spreading through a social network. Both follow network-based transmission dynamics with reproduction numbers, super-spreaders, and herd immunity thresholds.

A2. For each of the following problems, apply Step 1 of the six-step method (Abstract Your Problem). Rewrite each problem statement in abstract, domain-independent language.

a) "Our customer support team takes too long to resolve tickets because the handoff between first-tier and second-tier support loses critical context about the customer's issue."

b) "The city's public transit system is unreliable because a delay on one line cascades through the network, making all connected lines late."

c) "Our marketing team keeps optimizing for click-through rates, but the customers who click the most are the ones least likely to make a purchase."

d) "The school district adopted a standardized testing regimen to improve educational outcomes, but teachers now spend most of their time teaching to the test rather than developing critical thinking."

e) "Our company grew rapidly to 500 employees but the informal communication networks that worked at 50 people have broken down, and nobody knows what other teams are doing."

f) "The nonprofit's fundraising model relies on a small number of very large donors, making it vulnerable to any single donor withdrawing support."

A3. For each abstracted problem in A2, identify which pattern family (or families) from the book it belongs to. Name the specific chapter(s) most relevant to each problem.

A4. Martin Elliott saw a Formula One pit stop and recognized a surgical handoff. For each of the following, identify a cross-domain analogue -- a solution in a completely different field that addresses the same structural problem.

a) A restaurant kitchen that needs to coordinate multiple orders at different stages of preparation for simultaneous delivery to the same table.

b) A venture capital firm trying to decide which startups to fund when most will fail but a tiny number will generate enormous returns.

c) A government trying to regulate a new technology (say, AI) without stifling innovation or falling behind other countries.

d) A jazz ensemble that must coordinate improvised performances without a conductor or a fixed script.

e) A conservation biologist trying to decide which species to prioritize for protection with limited resources.

Part B: Analysis and Explanation

These exercises develop the ability to analyze the structural mechanisms of cross-domain transfer.

B1. The Gick and Holyoak experiment (Section 43.2) found that participants who read an analogous medical story could solve the fortress problem -- but only when told the stories were related. Design a thought experiment that tests whether training in abstraction (Step 1 of the six-step method) reduces the need for explicit hints. What would you predict? Why?

B2. Explain why the household-nation analogy is classified as a false analogy rather than merely a weak one. Specifically, identify which of the five analogy quality test questions it fails most critically, and explain how this failure leads to actively wrong policy conclusions rather than merely unhelpful ones.

B3. Consider the analogy between biological evolution and cultural evolution (the spread of ideas, practices, and technologies). Apply all five questions of the analogy quality test.

a) Do the systems share the same elements? What corresponds to genes, organisms, selection, and mutation in cultural evolution? b) Do the relationships between elements map correctly? Is cultural transmission like genetic inheritance? c) Does the analogy preserve causal mechanisms? Does cultural change work the way biological evolution works? d) Where does the analogy break? What features of biological evolution have no cultural counterpart, and vice versa? e) Does the analogy generate testable predictions? Name one prediction the analogy makes about cultural change and how you would test it.

B4. For each of the four common transfer mistakes (false analogy, surface matching, ignoring context, assuming universality), give one real-world example not mentioned in the chapter. For each example, explain which step of the six-step method would have caught the mistake.

B5. The chapter argues that expertise can be an obstacle to cross-domain transfer (the "expertise trap"). But expertise is also obviously valuable. Write a 300-word analysis of the tension between deep expertise and broad pattern recognition. Under what conditions does expertise help transfer, and under what conditions does it hinder it?

B6. The chapter places analogies on a five-level spectrum from identity to false analogy. For each of the following analogies, place it on the spectrum and explain your reasoning:

a) The spread of a computer virus through a network and the spread of a biological virus through a population. b) An electrical resistor and friction. c) The brain as a computer. d) The differential equation for population growth and the differential equation for compound interest. e) A military "campaign" and a marketing "campaign."

Part C: Application to Your Own Domain

These exercises apply the six-step method to problems in your own field or area of expertise.

C1. Identify a problem in your own work or life that you have been unable to solve. Apply all six steps of the cross-domain transfer method:

a) Abstract the problem (write both the domain-specific and abstract versions). b) Identify the pattern family. c) Search for analogues in at least three different fields. d) Choose the most promising analogue and translate the solution. e) Stress-test the analogy using all five questions of the analogy quality test. f) Design a small-scale implementation plan.

C2. Think of a time when you successfully transferred a skill or insight from one domain to another (even informally). Reconstruct the transfer process in retrospect:

a) What was the source domain and the target domain? b) At what level of abstraction did the transfer happen? c) Was it near transfer or far transfer? d) Which of the six steps did you do (even intuitively), and which did you skip? e) Looking back, would applying the analogy quality test have improved the transfer?

C3. Design your personal cross-domain reading plan. Identify:

a) Your primary domain of expertise. b) Three fields that are structurally adjacent to yours (similar types of problems, different surface features). c) Three fields that are structurally distant from yours (different types of problems entirely). d) One book or article from each of these six fields that you will read in the next six months. e) For each, explain why you chose it and what patterns you hope to find.

C4. Identify three people in your life who work in different fields from yours. For each, write a brief description of how their field might contain solutions to problems in your field. Then have the conversation -- describe your abstracted problem and ask how their field would approach it. Record what you learn.

C5. Start an "Analogy Journal." For one week, record every analogy you encounter -- in conversation, in reading, in your own thinking. For each analogy, apply the analogy quality test. At the end of the week, analyze: How many of the analogies you encountered were structural? How many were merely surface? What patterns do you notice in how analogies are used in your daily life?

Part D: Synthesis and Integration

These exercises require combining ideas from multiple chapters and applying them to novel situations.

D1. This chapter presents the six-step method as a linear process. But real cross-domain transfer often involves loops -- you abstract the problem, search for analogues, realize the abstraction was wrong, re-abstract, search again. Using the concepts from Chapter 2 (Feedback Loops) and Chapter 7 (Gradient Descent), redesign the six-step method as an iterative process with explicit feedback mechanisms. Where are the feedback loops? Where should you "descend the gradient" of better abstraction?

D2. Chapter 14 (Overfitting) warns about the danger of fitting a model too closely to the training data. Apply this concept to cross-domain transfer. In what sense is a too-specific analogy "overfitted"? What is the equivalent of a training set and a test set in the context of analogical reasoning? How would you "regularize" your analogies to avoid overfitting?

D3. Chapter 24 (Paradigm Shifts) describes how fields periodically undergo revolutionary changes in their fundamental frameworks. Apply this to cross-domain thinking itself. What would a "paradigm shift" in cross-domain transfer look like? What is the current paradigm, and what anomalies might trigger a shift? (Consider the role of AI and large language models in reshaping how analogies are found.)

D4. Chapter 34 (Skin in the Game) argues that decision-makers should bear the consequences of their decisions. Apply this to cross-domain transfer. When you import a solution from another field, who bears the risk if the analogy is wrong? How should accountability for cross-domain transfers be structured in organizations? What happens when "innovation consultants" import solutions from other fields but do not bear the consequences of failure?

D5. Combine the concepts from at least four chapters to analyze the following scenario: A hospital system decides to adopt Toyota's lean manufacturing principles to reduce waste and improve efficiency. Apply the six-step method to evaluate this transfer. Then apply the concepts of Goodhart's Law (Ch. 15), conservation of complexity (Ch. 41), Chesterton's fence (Ch. 38), and iatrogenesis (Ch. 19) to identify potential failure modes. Write a 500-word analysis.

D6. Chapter 25 (The Adjacent Possible) describes how innovation happens at the boundary of what currently exists and what is newly reachable. Apply this to your own cross-domain thinking. What is the "adjacent possible" of your Pattern Library? Which patterns are you most likely to discover next, given what you already know? What new connections are now reachable because of the patterns you learned in this book?

Part E: Advanced Problems and the Capstone

These exercises push into creative and evaluative territory at the highest Bloom's levels.

E1. The chapter describes four common transfer mistakes. Propose a fifth mistake that is not mentioned in the chapter. Describe it, give an example, explain why it is dangerous, and suggest how to avoid it.

E2. Design a "cross-domain transfer workshop" for your organization or community. The workshop should:

a) Take no more than three hours. b) Teach the six-step method through practice, not lecture. c) Include a group exercise where participants from different fields work together on a shared problem. d) Include a stress-testing exercise where participants deliberately try to break each other's analogies. e) Produce a concrete output (a list of cross-domain insights relevant to the organization's challenges).

Write the complete workshop plan, including timing, materials, and instructions for each activity.

E3. The chapter argues that cross-domain transfer is a skill, not a gift. Construct a counterargument: what evidence or reasoning might suggest that cross-domain thinking depends on innate capacities (such as working memory, cognitive flexibility, or openness to experience) that are not equally distributed and not easily trained? Then evaluate both sides. What is the strongest version of each argument? What does the evidence actually suggest?

E4. THE CAPSTONE ESSAY (see Section 43.10 for full instructions).

Write a 2,000-3,000 word essay applying at least five patterns from this book to a single problem, question, or situation that matters to you. Follow the structure given in Section 43.10:

1. State the problem (300-500 words)
2. Abstract the problem (200-300 words)
3. Apply at least five patterns (1,000-1,500 words)
4. Identify the interactions between patterns (300-500 words)
5. Stress-test your analysis (200-300 words)
6. Propose action (200-300 words)

This is the culminating work of the book. Take your time. Make it matter.

E5. After completing the capstone essay, write a 500-word reflection on the process:

a) Which patterns were easiest to apply? Which were hardest? b) Where did you find genuine structural parallels, and where did you suspect you might be forcing the analogy? c) What surprised you about the interactions between patterns? d) How did the process of writing the essay change your understanding of the problem? e) What would you do differently if you wrote the essay again?

Part M: Mixed Practice (Interleaved Review)

These problems mix skills and concepts from across the chapter and across the book, providing the interleaved practice that research shows produces the deepest learning.

M1. A city government is struggling with homelessness. A well-meaning official proposes the following analogy: "Homelessness is like a disease -- it spreads, it has risk factors, and we should treat it with evidence-based interventions the way we treat illness." Apply the analogy quality test. Then identify which of the four common transfer mistakes the official might be making. Then propose a better analogy from a different field that might yield more productive policy insights.

M2. You are a software engineer who reads a book about forest ecology and learns about succession -- the process by which a forest regenerates after a disturbance, with pioneer species preparing the ground for later species (Ch. 32). You wonder whether this pattern applies to software systems. Walk through all six steps of the transfer method, identifying what "pioneer species," "climax community," "disturbance," and "succession" might mean in the software ecosystem context. Stress-test the analogy rigorously.

M3. Review your Pattern Library from the entire book. Identify the three strongest cross-domain connections you recorded and the three weakest. For each of the three weakest, explain why it is weak using the analogy quality test, and either strengthen it or discard it.

M4. The chapter identifies three conditions for far transfer: encoding at an abstract level, a rich library of abstract patterns, and active search for connections. For each of these three conditions, identify which chapters of the book most directly trained that specific skill. Give concrete examples.

M5. A friend reads this book and says, "This is all just metaphor. You're dressing up loose comparisons in scientific language and pretending they're rigorous." Write a 300-word response that acknowledges the legitimate concern behind this criticism while defending the difference between structural analogy and loose metaphor. Use at least two specific examples from the book.

M6. Write a letter to your past self -- the person you were before reading this book. In 500 words, explain what you have learned, what has changed in how you see the world, and what advice you would give to someone just beginning this journey. Be specific about which patterns have been most useful and which habits of mind have changed most.

M7. The book's first chapter began with a thermostat and a panic attack. This final chapter began with a surgeon and a Formula One pit crew. Both openings use the same technique: presenting two seemingly unrelated domains and revealing the structural pattern that connects them. Apply this technique yourself. Choose two domains you know well and write a 500-word opening that reveals a surprising structural parallel between them, in the style of this book.

M8. Imagine you are explaining the core thesis of this book to three different audiences: (a) a ten-year-old, (b) a professional in your field, and (c) a skeptical philosopher. Write a one-paragraph explanation for each audience. How does the level of abstraction, the examples you choose, and the language you use change for each audience? What stays the same?

M9. The book ends with the claim that cross-domain thinking is a learnable skill. Design an assessment that would test this claim empirically. What would you measure? How would you define "cross-domain thinking ability"? What would the experimental design look like? What results would confirm or disconfirm the claim?

M10. This is the final exercise in the book. Write one sentence -- the most important sentence you have encountered, formulated, or discovered in your journey through these forty-three chapters. It can be a sentence from the book, or a sentence of your own. Write it down. Put it somewhere you will see it every day. Let it work on you.