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    Observable behaviour vs personal impression

    Rumman Ansari July 25, 2026 5 views Subject Details
      ETHICS, FAIRNESS AND COMPLIANCE

    Observable Behaviour vs Personal Impression

    "I liked her" is not evidence. Learn to base every judgment on what a candidate actually said and did — observable behaviour — rather than on vague personal impressions that hide bias.

      Introduction

    After an interview, two very different kinds of statements can end up in your notes. One is observable behaviour: "She explained the algorithm clearly and tested two edge cases." The other is personal impression: "She seemed smart and I got a good feeling about her." They look similar, but only one is real evidence.

    Observable behaviour describes what actually happened — what the candidate said, did, or demonstrated. Personal impression describes how you felt. Impressions feel convincing, but they are unreliable, hard to defend, and a common hiding place for bias. This lesson teaches you to judge on behaviour, not impressions.

      "I liked them" tells you about the interviewer. "They explained it clearly" tells you about the candidate. Only one belongs in a fair decision.

      Learning Objectives

    After completing this lesson, you should be able to:
    • Define observable behaviour and personal impression.
    • Explain why impressions are unreliable and risky.
    • Tell the two apart in real interview notes.
    • Convert vague impressions into observable evidence.
    • Write objective, defensible assessments.

      Why This Matters

    Personal impressions are where bias quietly lives. "Good vibe," "not confident enough," "seemed like a fit" — these feelings are often shaped by similarity, first impressions, or appearance, not by ability. Basing decisions on them rejects capable candidates and rewards the wrong ones.

    Observable behaviour, by contrast, is specific, comparable, and defensible. If your decision is ever questioned, "she explained X and solved Y" holds up; "I had a good feeling" does not.

    CORE PRINCIPLE
    What They Said & Did > How I Felt About Them

      Two Very Different Things

    1

      Observable Behaviour

    What actually happened.

    Specific, factual actions and statements you witnessed — what the candidate explained, solved, built, or demonstrated. Anyone watching would agree it occurred.

    2

      Personal Impression

    How it made you feel.

    A subjective feeling or judgment — "smart," "confident," "likeable," "good fit" — that is not tied to a specific, observable action.

    Camera vs Mood

    Observable behaviour is what a camera would record — the actual words and actions. A personal impression is the mood you were in while watching. Two people watching the same footage should agree on the behaviour, even if their moods differ.

      Behaviour vs Impression: Side by Side

    Personal Impression Observable Behaviour
    "She's really smart." "She explained recursion clearly with an example."
    "He wasn't confident." "He paused often and could not justify his approach."
    "Great communicator." "He structured the answer and checked I followed."
    "Not a good fit." "She could not give an example of teamwork when asked."
    "Seemed weak." "He solved the basic task but missed all edge cases."

      Why Personal Impressions Are So Risky

      Problems With Impressions

    • They often hide bias and similarity effects.
    • They cannot be verified or defended.
    • They vary wildly between interviewers.
    • They reward confidence over competence.
    • They are shaped by first impressions.

      Strengths of Behaviour

    • Specific and factual.
    • Verifiable and defensible.
    • Consistent across interviewers.
    • Measures real ability.
    • Based on the whole interview.
      The danger of "confidence": a confident speaker can create a strong impression without real ability, while a nervous but capable candidate can be underrated. Behaviour cuts through this; impressions do not.

      Converting Impressions Into Behaviour

    When you notice yourself forming an impression, treat it as a signal to dig for the evidence behind it. Ask: "What did they actually say or do that made me think this?"

    Impression "What did I actually observe?"
    "Seems smart." "Broke the problem into clear steps and explained each."
    "Not confident." "Gave short answers and could not expand when asked."
    "Good attitude." "Described how they applied feedback to improve their code."
    "Weak candidate." "Could not explain the difference between two basic concepts."
      If you cannot find the behaviour behind an impression, that is a warning sign — the impression may be pure bias, and should not influence your decision.

      Writing Objective, Defensible Notes

    Your notes should read like a factual record, not a diary of feelings. Aim for notes that another person could read and understand exactly what the candidate did.

      Impression-Based Note

    "Really impressive candidate, great energy, I just felt she'd fit in perfectly with the team." Vague, subjective, and impossible to defend.

      Behaviour-Based Note

    "Solved the coding task, explained her reasoning step by step, and gave a specific example of resolving a team conflict." Clear, factual, and defensible.

      Worked Example: Two Verdicts on One Candidate

      A quiet candidate gives correct, well-reasoned answers but speaks softly and rarely smiles.

      Impression Verdict

    "Bit flat and not very confident — probably not a strong fit." This penalizes the candidate for personality, not ability, and hides bias.

      Behaviour Verdict

    "Answered all questions correctly, explained trade-offs clearly, and handled edge cases well." This judges the candidate on what they actually demonstrated.

      Best Practices

    • Record what the candidate said and did, not how you felt.
    • For every impression, find the observable behaviour behind it.
    • Discard any impression with no evidence to support it.
    • Beware of confusing confidence or charm with competence.
    • Write notes another person could read and understand.
    • Judge across the whole interview, not the first impression.