Tier9

How It Works

A simple, structured approach to turning collective intelligence into actionable probabilities.

Question
Forecasts
Probability
Decision
Outcome
Learning
Try It

See the Difference Good Questions Make

Toggle between a well-designed and poorly-designed question to see why specificity matters.

SpecificMeasurableVerifiable

"Will the US CPI inflation rate exceed 3.0% year-over-year in December 2025?"

Resolution:Bureau of Labor Statistics CPI-U report, released January 2026
Deadline:December 31, 2025
Outcome:YES if CPI-U ≥ 3.0%, NO otherwise
Interactive

Watch Crowd Wisdom in Action

Adjust individual forecasts and see how different aggregation methods produce different consensus values.

Forecaster 1
65%
Forecaster 2
72%
Forecaster 3
58%
Forecaster 4
80%
Forecaster 5
75%
Pro users get advanced aggregation methods including extremized means
Learn more
Calculator

Calculate Your Brier Score

Make a forecast, then see how it would be scored when the outcome is revealed.

Question: "Will it rain tomorrow?"

70%

Your forecast that YES, it will rain

The 5-Step Process

01

Ask better questions

Define measurable outcomes with clear resolution criteria. Good forecasting starts with well-specified questions that tie directly to real decisions.

  • Frame questions with specific, verifiable outcomes
  • Set clear resolution dates and data sources
  • Connect questions to real organizational decisions
02

Invite forecasters

Staff, experts, and public users join with play-money points. Build your forecasting community with the right mix of internal expertise and external perspectives.

  • Invite internal team members and domain experts
  • Open questions to the public crowd for diverse perspectives
  • Use play-money incentives to encourage participation
03

Aggregate beliefs

A simple market-making mechanism or scoring rule turns individual forecasts into consensus probabilities that update in real time.

  • Watch probabilities update as forecasters submit predictions
  • See how consensus shifts with new information
  • Track which forecasters have the best track records
04

Act on probabilities

Use consensus forecasts to trigger contingency plans, inform policy decisions, and allocate resources more effectively.

  • Set probability thresholds for action (e.g., 'if risk > 40%, activate plan')
  • Incorporate forecasts into decision-making frameworks
  • Monitor how probabilities evolve over time
05

Learn and improve

After resolution, the system scores forecasts and updates calibration stats. See who was accurate and how to improve future forecasting.

  • Automatic Brier scoring for resolved questions
  • Calibration charts show forecast accuracy over time
  • Leaderboards reward consistent accuracy

Ready to start forecasting?

Join our public hub to make your first predictions. Upgrade for private workspaces when you're ready.