A behavioral assessment asks how someone tends to work rather than what they know. Used as one structured input it adds something an interview misses; used as a filter it is the part of a hiring process most likely to be challenged.
What it measures, and what it does not
These instruments describe tendencies: how a person prefers to work, respond to pressure or interact with others. They do not measure skill, and they are not a substitute for a work sample. Their value is in making an interview more structured, by turning a vague impression into specific questions you ask every candidate for the role.
Consistency is what makes the process defensible
Same assessment, same stage, same interpretation rules, for every candidate for that role, with the reasoning recorded. Inconsistent use is both unfair and the pattern that produces a successful challenge. Write the rule before you start, and resist the temptation to add the assessment only for candidates somebody is unsure about.
Stay well away from anything that reads as a medical enquiry
Some instruments stray toward personality assessment that can function as a disability-related enquiry, which is restricted at the pre-offer stage in the US and sensitive everywhere. Check what the instrument actually asks, not just how it is marketed, and get advice if any item looks like a health question.
Monitor outcomes rather than trusting the manual
Track pass rates and hiring outcomes by group for your own applicant pool. A tool that appears neutral in a vendor study can behave differently with your candidates. If a pattern appears, stop using it for selection until you understand it; a documented decision to pause is a much better position than a defended one.
Questions people ask about behavioral assessment for employment
Is it legal to use behavioral assessments in hiring?
Generally yes, if the tool is job related, consistently applied and monitored for adverse impact. The problems come from how it is used rather than from the tool.
Should the result be shared with the candidate?
Sharing feedback is good practice and helps candidate experience. Some jurisdictions give a right to an explanation of a decision.
When is it most useful?
As structure for the interview, and for roles where working style is genuinely part of performance rather than a preference of the hiring manager.