What is project-based hiring?
Project-based hiring means you judge a candidate on a piece of real work from the job, done before or alongside the interview, instead of judging them mostly on a CV and a conversation. Industrial psychologists call that piece of work a work sample test. A copywriter rewrites a landing page. A junior analyst cleans a messy export and writes up what they found. A support hire answers five real, anonymised tickets.
The idea is old. What's new is how many employers say they want it. NACE's Job Outlook 2026 survey found 70 percent of employers using skills-based hiring for entry-level hires, up from 65 percent a year earlier, while the share screening candidates by GPA fell from 73 percent in 2019 to 42 percent. So employers want proof of skill. Most of them still try to collect that proof in a conversation, which is the weakest place to find it.
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Work samples vs unstructured interviews: the research before and after 2022
Work samples predict job performance clearly better than unstructured interviews, though both predict less than HR teams were taught for a quarter of a century. The old benchmark is Frank Schmidt and John Hunter's 1998 meta-analysis in Psychological Bulletin, which pulled together 85 years of studies. It gave work sample tests an operational validity of .54, the highest of any single method, against .51 for structured interviews and .38 for unstructured ones. By 2023 that paper had been cited more than 6,500 times, according to Sackett and colleagues, so you've almost certainly seen its numbers on a training slide.
In 2022 Sackett, Zhang, Berry and Lievens published a revision in the Journal of Applied Psychology. The argument is simple once you see it. Most validity studies are concurrent, meaning they test people already doing the job, and those groups usually aren't much narrower than the applicant pool. Earlier meta-analyses applied large statistical corrections for "range restriction" anyway, borrowed from predictive studies where the restriction really is big. That pushed many estimates up.
After the fix, unstructured interviews dropped to .19, half their old value, and structured interviews took the top spot at .42. Work samples fell from .54 to .33 for a different reason. Schmidt and Hunter's figure rested on a 1974 narrative review, so Sackett's team used Roth, Bobko and McFarland's 2005 meta-analysis in Personnel Psychology instead, which pooled 54 studies and landed on .33 with no range restriction correction at all.
Two details in Sackett's 2022 estimates get less attention than they deserve. Work samples varied less from study to study than structured interviews did (a standard deviation of .09 against .19), so you're less likely to end up with a dud version. And years of job experience, the thing CV screens lean on hardest, fell from .18 to .07. If you're filtering on "3+ years" before anyone has seen a line of work, you're filtering on very little.
For the record, a validity of .33 is a corrected correlation between scores on the method and job performance. It won't pick your best hire for you. It shifts the odds.
Assessment methods compared
Structured interviews, job knowledge tests and work samples sit near the top for validity, while unstructured interviews and years of experience sit near the bottom. The table below uses the side-by-side comparison Sackett and colleagues published in Industrial and Organizational Psychology in 2023, which puts their 2022 estimates next to Schmidt and Hunter's. The fourth column is the standardised Black-White score gap (Cohen's d) reported for each method. Bigger numbers mean more risk of adverse impact.
| Method | Schmidt & Hunter (1998) | Sackett et al. (2022) | Black-White gap (d) | Where it fits |
|---|---|---|---|---|
| Structured interview | .51 | .42 | .23 | Almost any role, if questions and scoring are fixed in advance |
| Job knowledge test | .48 | .40 | .54 | Roles where people must arrive already knowing the material |
| Work sample test | .54 | .33 | .67 | Experienced hires, or trainable basics for entry roles |
| Cognitive ability test | .51 | .31 | .79 | High-volume screening, with close attention to adverse impact |
| Assessment centre | .37 | .29 | .52 | Graduate schemes and leadership pipelines |
| Situational judgement test (knowledge) | not covered | .26 | .39 | Early screening at volume |
| Unstructured interview | .38 | .19 | .32 | Selling the role and building rapport, not selecting |
| Years of job experience | .18 | .07 | .49 | Context only |
Source: Sackett et al. (2023), Table 1, Industrial and Organizational Psychology. The same table lists two later updates: assessment centres rise to .33, tying work samples, and cognitive ability falls to .23 using 21st-century data.
Look hard at the work sample row. The validity is solid, but the subgroup gap of .67 is nearly three times the .23 for structured interviews. Work samples look job-related, so it's tempting to call them the fair option. This data doesn't support that by default. Fairness depends on what the task demands and on who has had the chance to practise it.
Work samples have limits, and the research says where
Work samples work best when candidates already have the skill being sampled, which is why they suit experienced hires better than people looking for a first job. Sackett and colleagues say this plainly in their 2023 follow-up: work samples and job knowledge tests generally don't fit entry-level hiring where people pick up the skills after they're hired, through training or on the job.
That's a real problem for graduate programmes and university placement teams. Ask a final-year economics graduate to build a financial model in your house template and you're mostly testing whether they did an internship at a bank. You aren't testing whether they'd be good at the job after six weeks of training. Run it for a few cycles and you'll hire from the same handful of campuses.
The same paper points to the way out. It describes work samples as more open to improvement through study and practice than ability or personality measures, which means you can tell people what to prepare and expect them to get better. For entry-level roles that suggests a few changes:
- sample the trainable basics of the job, such as a clear reply to an annoyed customer or finding the error in a small dataset, rather than firm-specific craft
- publish the brief, the scoring criteria and a worked example in advance, so practice counts for more than insider knowledge
- pair the project with a structured interview scored on the same competencies, since the interview has the highest average validity and the smallest subgroup gap in the table
Our view: the strongest project-based hiring setup in 2026 is a short work sample plus a structured interview, both scored on one rubric. The unstructured "tell me about yourself" chat belongs in the part of the process where you sell the job.