Find the Denominator
Out of how many?
The idea
A count means little without knowing what it is a count out of.
In the real world
Forty incidents is alarming or excellent depending on whether there were fifty or fifty thousand opportunities.
Going deeper
A count is uninterpretable without what it is a count out of, and rising counts with rising denominators can represent improvement.
Forty errors against 25 last month looks like deterioration until you learn the customer base doubled, at which point the rate fell. This is among the most common ways a true number misleads, and it is usually not deliberate — counts are easier to collect and report than rates. Converting one metric you report as a count into a rate typically changes how at least one recent conversation would have gone.
Where it stops applying
Absolute counts genuinely matter where each event has a fixed cost, such as incidents requiring investigation. Rate and count answer different questions and both have their place.
Why it matters
Missing denominators are the most common way a true number misleads.
Try this today
For one metric you report as a count, convert it to a rate.
Test yourself
A report states that 40 customers experienced an error last month, up from 25. What must you know before reacting?
Show the answer
How many customers there were in each month. If the base doubled, the rate fell. A rising count with a rising denominator can mean improvement, and without the denominator the direction of the change is genuinely unknown.
Learn this in the feed Answering from memory, then again days later, is what makes it stick.