What it is
The availability heuristic is the mental shortcut of judging frequency or probability by how easily an example comes to mind. Recent, vivid, or emotionally charged events are retrieved faster and therefore feel more probable than the base rate warrants. The bias is not a failure of intelligence - it is a feature of a memory system built for pattern recognition rather than statistical accuracy.
Where it shows up
In hiring decisions, a panel that recently made a bad hire from a particular background will downweight candidates from that background far beyond what the data supports. Conversely, a high-profile success story - a competitor's well-publicised acquisition or a TechCrunch feature - can trigger overinvestment in a similar direction simply because the example is salient, not because the underlying economics are sound.
What Rubicon Probity does
When Rubicon Probity identifies a decision record at the Diagnose stage where a single recent event, case study, or anecdote is cited as primary evidence, it surfaces a NOTE flag and requests that the team supply base-rate data before the record moves to Decide. The challenge questions below are presented alongside the flag.
Detection questions
- What is the actual base rate for this outcome across comparable organisations, not just the examples you can recall?
- Would you weight this evidence the same way if the example had not been widely covered in the press or recently discussed in your team?
- Have you actively sought out evidence from outcomes you did not hear about - the cases that did not make the news?