The Work Sample Test Is the Best Predictor in Sales Hiring. Most Teams Run It Wrong.
A live exercise in the interview loop beats every other signal. Here's why most versions of it produce noise instead of data.
The research on this has been settled for decades. Work sample tests, asking a candidate to do an actual piece of the job in the room, outperform structured interviews, personality assessments, cognitive ability tests, and résumé review as predictors of job performance. Meta-analyses going back to Schmidt and Hunter in 1998 put their validity coefficient around 0.54. Structured interviews sit at roughly 0.51. Unstructured interviews, which is what most sales hiring managers are actually running, come in around 0.38. So if you are spending forty-five minutes asking someone to "tell me about a time they overcame objections" and then trusting your gut, you are leaving significant predictive power on the table. The frustrating part is that most sales teams do attempt a work sample. They just run it in a way that converts a high-validity instrument into an expensive vibe.
What Goes Wrong: The Audition Problem
The typical sales interview exercise looks like this. A candidate is given five minutes to prep a pitch, or handed a one-paragraph brief, then asked to "sell me this product" or run a mock discovery call with the hiring manager playing the prospect. Afterwards, the hiring manager forms an impression. Confident, good energy, seemed to know their stuff.
That is an audition, not a diagnostic. The problem is threefold.
No consistent brief. Candidate A gets two minutes of context and a friendly interviewer. Candidate B gets a detailed one-pager and a hostile one. You are measuring preparation luck and interviewer mood as much as anything else.
No rubric. Without a scoring guide written down in advance, you are not measuring competency. You are measuring how much the candidate reminds you of your best rep, which is a different thing entirely and likely encodes a raft of biases you would rather not think about.
Wrong level of difficulty. A work sample calibrated to an entry-level SDR role and an enterprise AE role should look completely different. Running the same "sell me this pen" exercise for both tells you almost nothing useful about either.
What a Work Sample Is Actually Trying to Surface
Before you design an exercise, you need to know what signal you are after. This depends on the competency level you are hiring for.
| Seniority Level | Primary Signal to Surface | Exercise Focus |
|---|---|---|
| SDR / BDR | Listening under pressure, objection acknowledgement, resilience to rejection | Cold call simulation, structured opener, live objection handling |
| Mid-market AE | Discovery depth, hypothesis-led questioning, deal qualification rigour | 20-minute mock discovery call with a prepared persona |
| Enterprise AE | Multi-stakeholder navigation, commercial framing, deal architecture thinking | Deal review or whiteboard session on a complex scenario |
| Sales Manager | Coaching quality, diagnosis accuracy, feedback specificity | Watch a recorded call, then coach the rep in the room |
The exercise design should follow from the competency, not the other way round. If you hand a mid-market AE candidate a cold call exercise, you learn about cold calling. If cold calling is ten percent of their actual job, you have just wasted forty minutes of everyone's time on a low-relevance signal.
The Four Components of a Properly Built Work Sample
1. A Standardised Brief
Every candidate gets the same written brief, delivered the same way, with the same lead time. If you give the brief ten minutes before the exercise, everyone gets ten minutes. The brief should include: the product or service they are selling (simplified, but realistic), the prospect persona with role, company, and stated business context, and any constraints on the format (time limit, what counts as out of scope).
What the brief should not include: hints about what you want to see. The brief is the setup, not a coaching document.
2. A Calibrated Scoring Rubric
This is the part most teams skip entirely and the reason most work samples produce noise. A rubric needs to do three things. First, it must specify the behaviours you are scoring, not the outcomes. You are not scoring "did they close?" You are scoring "did they confirm the prospect's timeline before proposing next steps?" Second, it must define what good, acceptable, and poor look like for each behaviour, written down in concrete terms before the exercise runs. Third, it must be scored independently by each assessor before discussion. Consensus-first scoring is just group vibes with extra steps.
A good rubric for a discovery call exercise might score five to seven specific behaviours: opening hypothesis quality, question sequencing, response to a deflection, commercial curiosity, and so on. If you want a starting point for what those behaviours should be, the Discovery Call Checklist maps the core structure.
3. A Trained Interviewer Playing the Prospect
The person playing the prospect is a variable in the experiment. If they improvise, you get inconsistent difficulty across candidates. The prospect role needs a defined script for their initial response, a defined moment at which they offer a deflection or objection, and clear instructions on what they will and will not volunteer unprompted. They are not trying to trip anyone up. They are trying to hold conditions constant.
4. A Debrief Segment
The exercise itself is only half the data. What a candidate does immediately after is often more revealing. Give them two minutes, then ask: what did you learn about this prospect? What would you do differently? What is your read on fit? A strong candidate will have a diagnosis. A weak candidate will have a story about how well it went. This debrief is where you see self-awareness and commercial judgement, two things the exercise itself often cannot fully surface.
The Common Versions and Where They Break Down
"Sell me this product cold." Fails because it tests showmanship, not the job. It rewards the candidate who is good at performing confidence rather than the candidate who is good at running a sales process.
"Pitch to us as a panel." Fails because the candidate knows they are being watched by three people who are not real buyers. The psychological conditions are wrong. You get rehearsed material, not adaptive thinking.
"Take home a case study and present back." Closer, but it tests preparation and presentation design more than live commercial thinking. It also advantages candidates with more time to spare, which is a proxy for circumstances rather than skill.
"Here's a real deal, tell us what you'd do." Better, but only if you have a rubric and a consistent scenario. Without those, you are comparing apples to how different each candidate's previous company's context was.
If you are running an exercise focused specifically on outbound skill, the Cold Call Certification Scorecard gives you a behaviour-by-behaviour scoring structure that maps onto this format directly.
A Repeatable Format You Can Run Tomorrow
Brief: written, delivered ten minutes before the exercise begins. Include persona, product summary, one stated business challenge.
Exercise: twenty minutes maximum. One interviewer plays the prospect, one scores. They do not speak to each other during the exercise.
Debrief: two minutes of candidate self-reflection, prompted by three fixed questions: what did you learn, what would you do next, what would you do differently.
Scoring: each interviewer scores independently on a 1-3 scale across each rubric behaviour before any discussion. Discuss only where scores diverge by more than one point.
Decision input: the work sample score is one input, not the verdict. It sits alongside structured interview scores and reference data. But it should carry the most weight, because the evidence says it deserves to.
Most sales hiring processes are heavier on conversation than on evidence. The work sample, built properly, is how you close that gap. The reason most teams do not build it properly is that it takes about a day to design and feels like overhead. So does a bad hire. One of those costs shows up on a spreadsheet.