What Does Commit to Detail Mean in an Interview?

By Murder Book Editorial TeamPublished by Gungrounds, the studio making Murder BookPublished 3 October 2026Updated 3 October 2026

"Commit to detail" is an interview strategy in which the interviewer encourages or requires the subject to provide specific, concrete details about their account, rather than allowing vague or general answers. The reasoning is practical: a detailed account is easier to check against other evidence than a broad one. Research suggests that truth tellers and liars handle detail differently. Truth tellers generally provide more details that can be independently verified, while liars tend to avoid specifics that could be checked and disproved. This does not mean that a detailed answer is always truthful or that a vague one is always deceptive, but pushing for detail gives investigators more material to corroborate or contradict.

Key takeaways

Committing a subject to detail means asking them to provide specific, checkable facts rather than accepting vague answers.
The Verifiability Approach, developed by Nahari, Vrij and colleagues, found that truth tellers provide more verifiable details than liars.
Telling interviewees that their details will be checked increases the difference between truthful and deceptive accounts.
Liars often avoid giving details that can be verified because they know those details could expose their story.
A lack of detail does not prove deception; some truthful people are naturally less descriptive or have genuinely forgotten specifics.

Why do interviewers push for detail?

The strategy rests on a simple principle: the more specific a claim, the more testable it becomes. If a suspect says they were "out that evening," there is little to check. If they say they were at a particular restaurant at 8 p.m. and paid by card, each element can be verified against records, CCTV footage or witness accounts.

Experienced interviewers learn to notice when a subject's account suddenly becomes vague or general, particularly during periods that are directly relevant to the investigation. As noted in research published through the National Criminal Justice Reference Service, guilty persons frequently practise deception by omitting information they believe will incriminate them, because leaving out details produces less stress than telling an outright falsehood. By asking the subject to commit to detail, the interviewer makes omission harder. For more on how omission works as a form of deception, see what omission means and whether it counts as lying.

What is the Verifiability Approach?

The most rigorous research on detail and deception comes from the Verifiability Approach (VA), developed by Galit Nahari, Aldert Vrij and colleagues. The approach starts from the observation that not all details are equally useful. Some details can be independently checked: they involve identifiable people, were witnessed by others, or were recorded by technology. Other details are inherently uncheckable: private thoughts, feelings or events that only the subject could know about.

In studies testing this approach, truth tellers consistently provided more verifiable details than liars, while liars provided more unverifiable details. This pattern makes sense. A truth teller drawing on real experience is more likely to mention things that happened in front of other people or left a paper trail. A liar, constructing or embellishing a story, tends to avoid details that could be disproved.

One important refinement is the Information Protocol. When interviewees are told at the start of the interview that their statements will be checked for verifiable details, the effect becomes even stronger. Research published through the Centre for Research and Evidence on Security Threats (CREST) found that this instruction encourages truth tellers to include yet more checkable details, while liars do not increase theirs. In some studies, the Information Protocol pushed classification accuracy from around chance level to approximately 80%. For more on this research programme, see the Verifiability Approach explained.

How does this relate to other interview techniques?

Committing a subject to detail overlaps with several established interview strategies.

The Strategic Use of Evidence (SUE) technique, developed by Granhag, Hartwig and colleagues, also relies on the principle that detail helps. When an interviewer withholds evidence and lets the subject commit to a detailed account first, any inconsistencies between the account and the evidence become apparent. The SUE technique showed that late disclosure of evidence raised deception detection accuracy from 42.9% to 61.7% in a 2005 study. Without detail in the subject's account, there would be nothing to compare against the evidence. For more, see how investigators use evidence strategically.

The Asymmetric Information Management (AIM) method takes a related approach. Interviewers tell subjects that providing longer, more detailed statements will make it easier for the investigator to determine whether they are telling the truth. Research found that truth tellers responded to this instruction by providing more information, while liars were more likely to withhold it.

Technique	Core idea	How detail is used
Commit to detail	Push for specific, checkable facts	Creates material for later verification
Verifiability Approach	Distinguish verifiable from unverifiable details	Measures the ratio of checkable to uncheckable claims
SUE	Withhold evidence, then compare	Compares detailed account against known evidence
AIM	Tell subject that detail helps verify truth	Observes whether subject increases or limits detail

Can a truthful person give few details?

Yes, and this is a critical caveat. Some people are naturally less descriptive. Others may have genuinely poor memory for specific times, places or sequences. Stress, fatigue and the passage of time all degrade memory, and a truthful person interviewed weeks after an event may provide fewer details than one interviewed the same day. Research on how time affects eyewitness memory shows that memory loss is normal and expected.

There are also cultural and individual differences in communication style. A person who gives short, direct answers is not necessarily hiding something. The commit-to-detail strategy works best when the interviewer interprets detail in context, rather than treating a lack of specifics as automatic evidence of deception.

What are the limits of this approach?

The Verifiability Approach has shown promising results in controlled studies, but researchers have noted several boundaries. In at least one study examining lies about a person's occupation, the approach was unable to distinguish between truthful and deceptive statements. This suggests that the type of lie and the context in which it is told matter.

Additionally, a sophisticated liar who understands the technique could deliberately include false but checkable details, relying on the assumption that the investigator will not actually verify all of them. This is why committing a subject to detail is most effective when combined with actual follow-up investigation: checking the details the subject provides against records, witnesses and physical evidence.

How does Murder Book use detail in interrogation?

In Murder Book: The Art of Interrogation, an upcoming narrative interrogation game from Gungrounds, players examine suspects' accounts for gaps, inconsistencies and missing detail. Development screenshots show an evidence board where statements are linked to physical evidence, such as a fabricated description of a gun. The game asks players to notice when a suspect's story is suspiciously vague or when specific details do not match what is known.

This reflects the real-world principle behind committing to detail. A suspect who avoids specifics gives the player less to work with; one who commits to a detailed account creates opportunities to find contradictions. Murder Book is in development for PC (Steam) and mobile, with release currently planned for the end of Q2 2027. For more on how investigators find inconsistencies, the process is similar.