Soft skills: how to assess them with evidence

When a hiring process falls apart, it’s rarely because of a missing technical skill. It’s usually because of a soft skill that was poorly assessed: the person knew how to do the job, but didn’t fit the team, couldn’t handle the pressure, or didn’t communicate the way the role required. And yet, soft skills are precisely the ones almost always judged “by eye” in an interview.

Assessing soft skills with evidence means translating them into observable behaviors and measuring them with the same yardstick for every candidate, instead of judging them by impression. It’s not about putting a number on likability, but about getting a comparable signal on how each person tends to behave in what the role requires, assessed the same way for everyone.

Why the interview alone isn’t enough to assess them

The interview is the place where soft skills are traditionally assessed, and it’s where they’re assessed worst. Not because the conversation isn’t useful, but because every conversation is different: different interviewer, different day, different mood. What gets measured there isn’t the person’s skill, it’s the impression they left in that moment. And the impression is loaded with biases —likability, similarity to ourselves, the first sentence— that don’t predict performance.

The result is that you compare candidates by how much you liked them, not by how they behave in relevant situations. To truly assess the skill, you need to move it out of the realm of impression and into that of comparable evidence.

How to translate a soft skill into something assessable

The step almost no one takes is the most important: turning the skill into observable behavior.

1. Define what behavior you expect to see. “Good communication” can’t be assessed; “explains a complex idea clearly and adapts the message to their audience” can. Working with behavioral competencies is exactly this: moving from the adjective to the behavior.
2. Choose the role’s competency, not a generic list. The soft skills that matter depend on the role. The guide to choosing competencies by role helps you keep the ones the position actually requires.
3. Assess with the same yardstick for everyone. Behavioral competency and work personality tests describe tendencies and styles consistently, so you compare signal with signal and not impression with impression.

What a soft skill test says and what it doesn’t

A competency or work personality test describes tendencies and styles of behavior; it doesn’t issue a verdict or predict anyone’s success. What it gives you is a comparable signal on how the person tends to behave in situations relevant to the role, assessed the same way for every candidate. That signal supports your decision and enriches the later interview —which now goes deeper based on evidence, not on a first impression— but it doesn’t replace it. The person decides; the tool provides comparable judgment, not the answer.

This applies to soft skills and complements technical ones: a complete process usually combines both, because verifying technical skills answers a different question about the same candidate.

In short

Assessing soft skills with evidence means translating them into observable behaviors and measuring them with the same yardstick for every candidate, instead of judging them by the impression they left in an interview, where likability and the first sentence weigh more than performance. The method consists of defining what behavior you expect to see, keeping the competencies the role actually requires, and assessing them in a comparable way with behavioral competency and work personality tests. Those tests describe tendencies and styles, they don’t predict success or replace the conversation: they provide a comparable signal that organizes the decision, which remains human. To see the behavioral competencies that describe a role’s soft skills, explore the library.