The behavioral science glossary

Plain-language definitions for the instruments, models, and terms behind Mappa's behavioral assessment for hiring.

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Jammil Handal
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“Mappa's process is smart, efficient, and consistently delivers the right fit for Priority's specific needs.”
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Foundational concepts

Psychometrics

  • Item response theoryPsychometrics

    Item response theory, or IRT, is a scoring approach that models how each individual item in an instrument behaves, rather than simply averaging every answer as if all questions carried equal information.

    An item everyone tends to agree with reveals very little about anyone in particular. An item that reliably separates people at the high end of a trait reveals a great deal about the high end and little about the low end. IRT builds a model of each item's specific behavior and uses that structure to estimate the underlying trait, rather than treating every answer as equally informative.

    How it shows up

    Two people can answer the same number of questions the same way, on average, and still land at different estimated trait levels, because IRT weighs which specific items they agreed with, not just how many.

    Why it matters

    IRT is one of the more technical, and genuinely differentiating, pieces of modern psychometrics, a meaningfully more precise approach than simply adding up or averaging answers.

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Hiring outcomes

Company culture

Assessment instruments

Speech & model terms