When history helps—and when it hinders—in scenario stress testing
“It’s tempting to look for patterns in the past, but history rarely repeats on cue.” This article examines why relying too heavily on historical analogies when stress testing for geopolitical shocks can lead to blind spots. By exploring both the strengths and limits of learning from precedent, readers gain tools for framing better questions about today’s unique risks.
1.The appeal and the trap
Drawing from history is a favourite approach for analysts. It provides reference points and a sense of precedent. Yet, the more one relies on familiar narratives, the greater the risk of missing what is genuinely new. In scenario stress testing, history should be a compass, not a map—helpful for orientation, but not for precise navigation.
Historical patterns offer insight but may oversimplify complex events.
2.Context is everything
Every analogy has blind spots. The context that shaped past events can differ dramatically from current circumstances. Technologies, political alliances, and economic systems evolve, making today’s shocks potentially distinct. Effective scenario design asks which elements match the present, and which are obsolete or misleading.
Analogies must be checked against present-day realities.
3.Beyond the replay button
Stress testing becomes more robust when it incorporates variables unique to the present moment—emerging technologies, regulatory shifts, or new actors. By adding these elements, the scenario avoids becoming a mere replay of old stories, instead reflecting the complexity of today’s environment.
Layering new variables strengthens scenario analysis.
4.Testing and retesting assumptions
Assumptions based on historical analogy should be questioned systematically. Thought experiments that flip the script—"What if the past offers no guidance here?"—help uncover new risks. This approach pushes planners to remain open to uncharted outcomes, reducing the risk of repeating previous misjudgments.
Challenging assumptions helps avoid repeated errors.