Coaching practices for Base Rate Planning
Describe almost anything you are working through and IX Coach finds the practices whose real-world fit is closest. For Base Rate Planning, these are the strongest matches in the current practice library.
Does this sound like the set of challenges you might be facing?
- I’m putting a timeline on this project from the plan in my head, and it always feels doable
- I build my estimate from my own optimistic story first and only glance at how long these things usually take at the very end as a sanity check
- Each project wraps up and I move straight on without ever writing down what I’d guessed versus what actually happened
- When I look for examples of people who did what I’m about to do, all I find are the success stories
- One story has completely sold me on something and I’m about to act on it
Practices that may help
- Base-Rate Neglect: Why We Ignore the Odds
Base-rate neglect is the tendency to underweight or ignore prior probabilities (how often things happen in general) when vivid, specific information is available. Identified by Kahneman and Tversky, it is one of the most robustly replicated biases in judgment research, and it leads to systematic overconfidence in predictions about specific cases. Correcting it requires actively looking up or estimating base rates before evaluating individual information. - Use reference class forecasting for project estimates
Estimate how long similar projects have taken historically before estimating your specific project.
Base-Rate Neglect: Why We Ignore the Odds - Anchor on the base rate before adding inside-view details
Start your forecast from the class median, then adjust — do not start from your narrative and adjust to the base rate.
Reference Class Forecasting - Reference Class Forecasting
Reference class forecasting, developed by Daniel Kahneman and Amos Tversky and formalized by Bent Flyvbjerg, improves forecast accuracy by anchoring on the statistical distribution of outcomes for similar past projects rather than on the details of the current one. The method reliably corrects the optimism bias that inflates cost, time, and benefit estimates in planning — the evidence base here is real and specific. - The Planning Fallacy — Why Your Estimates Are Always Wrong
The planning fallacy is the well-replicated tendency to underestimate completion times even when you know your past projects ran late. The fix is not to "try harder" — it is to switch from imagining the ideal future scenario to consulting your own base-rate history and similar projects. - Conduct post-project debriefs to contribute to the class data
Record actual vs. forecast outcomes honestly — this builds the reference class that future forecasts depend on.
Reference Class Forecasting - Actively seek disconfirming cases
When researching base rates, specifically look for cases where things went badly — failure cases are underrepresented in natural memory.
The Outside View - Ask the base rate before evaluating the specific case
Before judging any individual instance, first establish how often this kind of thing happens in general.
Base-Rate Neglect: Why We Ignore the Odds - Identify the right reference class for your situation
Find a well-defined set of past situations that are structurally similar to yours and collect their outcome data.
Reference Class Forecasting - Reference class forecasting
Before estimating, look up how long similar past projects actually took — not how they felt.
The Planning Fallacy — Why Your Estimates Are Always Wrong
Related concerns
- Building Base Rate Data
Base-rate neglect is the tendency to underweight or ignore prior probabilities (how often things happen in general) when vivid, specific information is available. Identified by Kahneman and Tversky, it is one of the most robustly replicated biases in judgment research, and it leads to systematic overconfidence in predictions about specific cases. Correcting it requires actively looking up or estimating base rates before evaluating individual information.
- Planning Fallacy Base Rates
The planning fallacy is the well-replicated tendency to underestimate completion times even when you know your past projects ran late. The fix is not to "try harder" — it is to switch from imagining the ideal future scenario to consulting your own base-rate history and similar projects.
- Project Forecast Accuracy
Represent your forecast as a range of likely outcomes, not a single predicted number.
Forecast a distribution, not a point estimate
- Base Rate Business
Base-rate neglect is the tendency to underweight or ignore prior probabilities (how often things happen in general) when vivid, specific information is available. Identified by Kahneman and Tversky, it is one of the most robustly replicated biases in judgment research, and it leads to systematic overconfidence in predictions about specific cases. Correcting it requires actively looking up or estimating base rates before evaluating individual information.
- Base Rate Prediction
Base-rate neglect is the tendency to underweight or ignore prior probabilities (how often things happen in general) when vivid, specific information is available. Identified by Kahneman and Tversky, it is one of the most robustly replicated biases in judgment research, and it leads to systematic overconfidence in predictions about specific cases. Correcting it requires actively looking up or estimating base rates before evaluating individual information.
- Failure Base Rate
Base-rate neglect is the tendency to underweight or ignore prior probabilities (how often things happen in general) when vivid, specific information is available. Identified by Kahneman and Tversky, it is one of the most robustly replicated biases in judgment research, and it leads to systematic overconfidence in predictions about specific cases. Correcting it requires actively looking up or estimating base rates before evaluating individual information.
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