Hiring managers may know the role well but still lack the training needed to evaluate candidates consistently.gettyHiring managers can know a role inside and out. But that doesn’t mean they are prepared to evaluate the candidates interviewing for it. University of Phoenix research found that roughly one in four non-HR hiring stakeholders receives no interview training. Many are expected to assess candidates without a consistent method for asking questions, comparing responses or judging job-related skills.Without that structure, job interviews can become highly subjective. Managers may give too much weight to confidence, rapport or first impressions. A 2025 systematic review published in F1000Research examined factors affecting the validity and reliability of employment interviews. The authors identified interviewer preparation, confirmation bias, affinity bias and inconsistent ratings as recurring threats to sound hiring decisions.That creates a problem for qualified candidates. A poor interview result may reflect their performance, but it can also stem from ambiguous questions or an interviewer relying more on instinct than evidence.Some Hiring Managers Lack Interview TrainingManagers often learn how to interview by watching others, repeating questions they have been asked or relying on instinct. That can leave them with little guidance on how to evaluate candidates consistently or separate a polished answer from demonstrated ability.The University of Phoenix research found that 57% of hiring managers wanted more training on assessing candidates’ skills. The gap is especially relevant as more companies adopt skills-based hiring. Without clear criteria, managers may still fall back on familiar credentials, personal preferences or vague judgments about fit.Knowing what the role requires is useful, but interviewing well also means knowing how to ask job-related questions, probe for specific examples and compare candidates against the same standards.Unstructured Interviews Leave More Room For SubjectivityWhen hiring managers vary their interview questions or let the conversation unfold without a clear structure, candidates may be judged on very different information. One person may be asked to describe specific results, while another may spend most of the interview discussing career history, personality or shared interests.That flexibility can make the conversation feel natural, but it also gives personal judgment more influence. Confidence, communication style and rapport can begin to carry as much weight as relevant skills and experience. A candidate who interviews well may appear more capable than someone with stronger qualifications who is nervous, introverted or less comfortable talking about their accomplishments.Structured interviews reduce some of that inconsistency by using the same core questions and evaluation criteria for every candidate. This gives hiring managers a more reliable basis for deciding who should advance.First Impressions Can Overshadow QualificationsFirst impressions form quickly and can shape how a hiring manager interprets the rest of the interview. A confident introduction may create a positive perception that carries through the conversation. Visible nervousness, an awkward first answer or an unfamiliar communication style can have the opposite effect.A 2023 experimental study published in the Journal of Personnel Psychology found that anxious nonverbal behavior influenced interview performance ratings. An interviewer may mistake that discomfort for a lack of confidence, leadership ability or competence, even when the candidate’s experience shows otherwise. Once an interviewer forms an early opinion, confirmation bias can influence what they notice next. They may give greater weight to answers that support that view and discount information that challenges it.Poorly Run Interviews Can Drive Candidates AwayWeak interviewing practices can also cost companies strong candidates. A 2024 Greenhouse candidate experience report found that 20% of candidates had rejected a job offer because of a poor interview experience. Candidates also reported problems such as discriminatory questions, ghosting and drawn-out hiring processes.Greenhouse CEO Daniel Chait described the problem this way: “Drawn-out interviews, misleading job descriptions and ghosting only make for a frustrating candidate experience.” For qualified candidates, the interview offers a preview of how the company communicates, makes decisions and treats people. A disorganized or disrespectful process can raise doubts about the manager, the team and the role itself. Even when a job offer follows, the candidate may decide the experience revealed enough to walk away.What Effective Interviewing Looks LikeEffective interviews require deliberate planning around what the position demands and how each candidate will be evaluated. Hiring teams should agree on the necessary skills, assign interviewers to assess specific areas and define what candidates need to demonstrate in their answers. Every candidate is then asked the same core questions and measured against the same job-related criteria.A simple scoring system can help hiring managers distinguish demonstrated ability from confidence, likability or familiarity. Interviewers can record their ratings before discussing candidates so one person’s opinion doesn’t shape everyone else’s assessment. Training can also cover follow-up questions, note-taking, legal boundaries and common sources of bias. Together, these practices give hiring managers a more consistent way to compare candidates and make decisions based on the demands of the job.What Highly Qualified Candidates Can DoYou have little control over an interviewer’s training or the company’s evaluation process. Prepare examples that show the problem you faced, the action you took and the result you produced. Connect each one directly to a responsibility or challenge mentioned in the job description.It can also help to introduce more structure during the conversation. When a question is vague, ask which part of your background would be most useful to discuss. Before the interview ends, summarize two or three reasons you are a well-qualified candidate and address any concern the interviewer has raised. Thoughtful preparation can reduce the chance that your qualifications get lost in a scattered conversation or overshadowed by someone who simply interviews better.A Job Rejection Is Not Always An Objective VerdictCandidates are often told to treat every rejection as feedback. Sometimes that’s useful. Skills, experience and interview performance all matter. So do the quality of the questions, the interviewer’s preparation and the consistency of the evaluation process.A rejection may reflect a gap in experience or a manager who relied too heavily on instinct, confidence or first impressions. Review what you can improve, but don’t assume every outcome accurately measures your ability.When hiring managers lack training, qualified applicants can be overlooked, subjective judgments can outweigh job-related qualifications and the process itself can push people away. Better hiring starts with giving managers the tools to assess demonstrated ability, not just impressions.Join 10,000+ experienced professionals who subscribe to the free Corporate Escape Artist newsletter for practical guidance on layoffs, toxic bosses, job search, career transitions and AI at work.