Resumes and interviews are good for filtering — they screen for background, fit, and obvious dealbreakers. They are poor at predicting follow-through, because credentials can be curated and interview answers can be rehearsed. To know who actually delivers, you need behavioral evidence: how a person behaves on real work in the first weeks. Use them together — interview to filter, then prove to confirm.
| Resume + interview | Behavioral proof | |
|---|---|---|
| What it shows | Credentials, work history, and how well someone performs in a 45-minute conversation. | How a person actually behaves on real work over the first weeks. |
| What it predicts | Weakly — past titles and interview polish correlate loosely with on-the-job delivery. | Strongly — recent behavior on hard tasks is the best signal of who follows through. |
| How gameable it is | Very — resumes are curated and interview answers can be rehearsed and coached. | Hard to fake — you cannot rehearse six weeks of showing up when the work turns messy. |
| When you learn the truth | Months after the offer, once the honeymoon ends and the hard part arrives. | Before you commit — the evidence lands inside the first 90 days. |
An interview is a fast way to filter for role fit, communication, and obvious dealbreakers.
A good conversation surfaces how a candidate reasons out loud — useful signal, honestly gathered.
It is also where the candidate decides on you. That matters, and no dataset replaces it.
The person who interviews best is often the person best at interviewing — not the one who delivers when work gets hard.
Resumes are curated and answers can be rehearsed. Polish is not proof.
The gap between the confident interview and the actual work only shows up months after the offer.
You do not have to choose between the interview and the evidence. Use the interview for what it is good at — filtering for fit and dealbreakers — then confirm the thing it cannot show. Put real, genuinely hard work in front of the person and watch how they behave over their first 90 days. That is where follow-through either shows up or it does not.
It is also the cheapest place to be wrong. The alternative — trusting a great interview and discovering the gap months later — is exactly how a bad hire gets expensive. If you want the full method, start with hiring for follow-through.
Hiring for follow-through means treating the interview as a filter and the first weeks as the proof. In practice it looks like a short checklist:
Only weakly on their own. Unstructured interviews are among the poorer predictors of performance because they reward charisma, rapport, and rehearsed answers — how well someone performs in a conversation, not how they behave on the actual work. Structured, job-relevant interviews do better, but even then the interview mostly filters. It rarely proves who follows through when the work gets hard.
A resume is a curated record of credentials and history. It confirms someone has the background, but past titles and pedigree correlate loosely with on-the-job delivery. A resume tells you what a person has done under other conditions and other managers — not how they will behave on your team when a hard task lands.
Because interviewing and working are different skills. A 45-minute conversation rewards confidence, storytelling, and quick answers. The job rewards follow-through when things get tedious or ambiguous. Someone can be genuinely great in the room and still stall the first time the work stops being fun — and you only find out months later.
Behavior over time, not first impressions. The strongest signal is how a person actually acts on real work in their first weeks: whether they take initiative before it is their job, push through hard problems instead of stalling, and learn fast when demands change. Behavioral evidence beats both the resume and the interview because it cannot be rehearsed.
Use the interview to filter, then prove it. Define what follow-through means in the role, put a genuinely hard piece of work in front of the person early, and watch how they behave over the first 90 days rather than how they answer in a single conversation. A Prove cycle scores Initiative, Applied Grit, and Learnability from real behavior so the read is evidence, not a gut feel.
Book a call to see how Prove confirms who actually delivers — before you commit.