Cognitive BiasesPublic knowledge library

Practice Lab

Forecasting & future choices

Learn to connect a practical check with the evidence-reviewed lens behind it. A real situation can involve several patterns, so each exercise asks for the best first lens among the listed options, not a diagnosis.

How to use this set

Read the check. Choose a lens. Then inspect the evidence.

Use these evidence-reviewed lenses when estimating uncertainty, imagining future feelings or preferences, or reviewing forecasts after the outcome is known.

Read the full decision guide before or after the set.

Exercise 1 of 6

In forecasting & future choices, which lens does this check belong to: “Does the total probability change when the same event is unpacked into explicit possibilities?”

  1. Subadditivity Effect
  2. Availability Heuristic
  3. Projection Bias
Show the best first lens

Subadditivity Effect

Does the total probability change when the same event is unpacked into explicit possibilities?

Evidence note People often give a larger total probability when an event is unpacked into separate possibilities than when the same event is judged as one packed category. The effect is not universal: how the possibilities are described and how typical they are can change or even reverse an unpacking effect.

Read the evidence review · Open the decision guide

Exercise 2 of 6

In forecasting & future choices, which lens does this check belong to: “Are the examples easy to recall because they are common, or because they are vivid, recent, or repeated?”

  1. Projection Bias
  2. Impact Bias
  3. Availability Heuristic
Show the best first lens

Availability Heuristic

Are the examples easy to recall because they are common, or because they are vivid, recent, or repeated?

Evidence note Availability is a judgment heuristic: people can use how easily examples or scenarios come to mind when estimating frequency or probability. That shortcut is not automatically an error because memorable or accessible examples can correlate with real frequency. Bias appears when accessibility is driven by factors that are not diagnostic of the quantity being judged.

Read the evidence review · Open the decision guide

Exercise 3 of 6

In forecasting & future choices, which lens does this check belong to: “Which part of today's state am I assuming will still describe my future self?”

  1. Hot–Cold Empathy Gap
  2. Projection Bias
  3. Impact Bias
Show the best first lens

Projection Bias

Which part of today's state am I assuming will still describe my future self?

Evidence note Projection bias describes a tendency to overproject current tastes or visceral states onto future preferences. People often understand that tastes will change but underestimate how much they will change. The construct is most directly supported in intertemporal choice and consumer settings; it should not be stretched into a generic explanation for every bad prediction about one's future self.

Read the evidence review · Open the decision guide

Exercise 4 of 6

In forecasting & future choices, which lens does this check belong to: “Am I forecasting the focal event while forgetting the rest of ordinary future life?”

  1. Impact Bias
  2. Hot–Cold Empathy Gap
  3. Hindsight Bias
Show the best first lens

Impact Bias

Am I forecasting the focal event while forgetting the rest of ordinary future life?

Evidence note People often overestimate how intense or long their emotional reactions to future events will be, especially when the focal event crowds out everything else that will also shape daily experience. The literature is broader than a rule that people always overpredict emotion: forecasting errors vary by event, time horizon, emotion, and what exactly is being predicted.

Read the evidence review · Open the decision guide

Exercise 5 of 6

In forecasting & future choices, which lens does this check belong to: “Am I predicting choices in a future hot or cold state from a state with different motives, cravings, pain, fear, or arousal?”

  1. Hindsight Bias
  2. Subadditivity Effect
  3. Hot–Cold Empathy Gap
Show the best first lens

Hot–Cold Empathy Gap

Am I predicting choices in a future hot or cold state from a state with different motives, cravings, pain, fear, or arousal?

Evidence note The hot–cold empathy gap describes difficulty predicting preferences, behavior, or experience across different visceral or affective states. In a relatively cold state, people can underappreciate how pain, hunger, sexual arousal, craving, fear, anger, and other hot states will change motivation and choice; in a hot state, they can also overproject the current state into the future. The pattern can be intrapersonal or interpersonal and should not be reduced to a generic claim that emotion always causes bad decisions.

Read the evidence review · Open the decision guide

Exercise 6 of 6

In forecasting & future choices, which lens does this check belong to: “What probability did I actually assign before I learned the outcome?”

  1. Availability Heuristic
  2. Hindsight Bias
  3. Subadditivity Effect
Show the best first lens

Hindsight Bias

What probability did I actually assign before I learned the outcome?

Evidence note Knowing an outcome can make the outcome look more predictable in retrospect. The effect has been studied for decades and across many settings, but it does not mean that every confident explanation after an event is biased.

Read the evidence review · Open the decision guide