How many tests to combine per role (and why 6-8)
Combining 6 to 8 tests usually covers a role's dimensions without overloading the candidate. The criterion isn't quantity: it's useful coverage.
For most roles, combining 6 to 8 tests usually covers the relevant dimensions without overloading the candidate. The number isn’t magic or rigid: it’s the range where a battery manages to read behavior, aptitude, technical skill and integrity without starting to repeat signals. With fewer, something goes unmeasured; with many more, you stretch out the assessment without adding judgment. The right number is the one that gives useful coverage and stops there.
Why fewer than 6 usually falls short
A real role has several dimensions: how the person behaves, how quickly they learn, what they know how to do, and how trustworthy they are in a sensitive role. With three or four tests it’s easy to cover one or two of those dimensions and leave the rest to impression. And impression isn’t comparable across candidates or defensible to an internal client. The band you didn’t measure is exactly where risk can hide.
Why more than 8 usually overdoes it
Once you’ve covered the role’s dimensions, each additional test tends to measure something you already measured. That carries two costs: the assessment grows longer—and good applicants, who have other options, drop out—and the reading gets diluted, because more data of the same kind adds no judgment, only noise.
| Battery size | Typical risk |
|---|---|
| 1–3 tests | Role dimensions unmeasured; decision by impression |
| 6–8 tests | Useful coverage without redundancy (practical range) |
| 10+ tests | Repeated signals, candidate fatigue, drop-off |
How to reach your number, not someone else’s
The 6–8 is a starting point, not a mandate. To find yours, start from the role:
- Describe in one sentence what the person does on a normal day.
- List the dimensions that sentence demands (behavior, aptitude, technical skill, integrity).
- Choose one block per relevant dimension; add one or two core competencies if the role calls for them.
- Add integrity controls if the role handles money, data or trust.
- Review: if two blocks measure the same thing, remove one.
A highly technical role may need more technical blocks; a simple operational one, fewer. The range shifts with the role.
Choose the right number of tests per role in the library.
Explorar la bibliotecaThe right number supports the decision, it doesn’t guarantee it
A battery of six to eight well-chosen tests gives you a comparable signal and evidence beyond the CV. But no number of tests predicts who will perform best or replaces the interview: the combination organizes the information so you can decide on a better basis. The person decides how they respond; you decide who advances.
In summary
Combining 6 to 8 tests usually covers a role’s dimensions without repeating signals or tiring the candidate. Fewer leaves gaps; more adds redundancy and drop-off. But the real number is dictated by the role: cover the dimensions it demands and stop. Kokoro helps you build the right combination per role: start by exploring the library or see how it works.