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244
Origin : Intelligence

🕵️ Intelligence

Interviewing & counter-intelligence techniques

Interviewing and analysis techniques from intelligence (HUMINT), counter-espionage and deception detection (e.g. statement analysis, the Reid technique, with its limits).

Full detail in the “Origin & history” section below.

244

The Consistency Test

Intelligence techniques Technique 244 / 360
Alexandre Baumberger

Author of the library

Alexandre Baumberger

Negotiation lecturer at KEDGE Business School

A rare threefold background serving negotiation: teaching, commercial justice and audit, backed by experience as a company director in Bordeaux.

  • Teaching, KEDGE Business School Negotiation lecturer since 2014 (12 years).
  • Commercial justice, Commercial Court Judge from 2018 to 2026: litigation, then insolvency proceedings.
  • Audit & advisory, over 20 years Tax, employment and financial audit in major firms, for large groups.
Full profile Contact him
In brief

The consistency test involves cross-checking a counterpart's statements over time and from several angles to verify that they tally, and to spot revealing contradictions. Asking, at different moments, questions to which you already know the answer allows you to assess the reliability of what is said without any accusationi.

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Reading level

At a glance

Its family profile at a glance

Effectiveness Psychologicalimpact Discretion Preparation Relationalrisk Ethics
8.0 / 10 Tactical potential

Vigilance: very high (9.0/10) · Preparation required: 7/10

Grounding in the source school Documented school

Indicative profile: it situates the “Intelligence techniques” family as the Intelligence school practises it, not this technique taken in isolation. Techniques from the same family and school therefore share the same profile. NEGOCOACH editorial rating out of 10, non-experimental · the higher the “relational risk” value, the more costly the technique is to the relationship.

NEGOCOACH assessment

How to read this rating

Tactical potential 8.0/10 (effectiveness, impact, discretion) and vigilance very high (relational and ethical risk): two distinct readings, deliberately never merged into a single score that would reward risk. NEGOCOACH editorial rating calibrated from the “Intelligence techniques” family and the “Intelligence” school. Each criterion is rated out of 10; click to understand what it measures.

  • Effectiveness 7/10 · High

    How far the technique can carry the negotiation in the intended direction when it is well executed.

  • Psychological impact 7/10 · High

    Strength of the effect produced on the counterpart's perceptions, emotions and decisions.

  • Discretion 10/10 · Very high

    How hard it is for the other party to notice the technique is being used. A high value = very discreet.

  • Preparation 7/10 · High

    The information, analysis and rehearsal required upfront to use it effectively.

  • Relational risk 8/10 · Very high

    Potential cost to the relationship and to trust if the technique is spotted, refused or fails. A high value = riskier.

  • Ethics 1/10 · Low

    Moral acceptability: fairness, transparency and respect for the counterpart's autonomy. A high value = more defensible.

Level of evidence

Documented school

The school this technique stems from is documented by recognised work and established practice, without experimental consensus. This indicator qualifies the school, not this technique taken in isolation.

Indicative NEGOCOACH editorial rating, for teaching purposes. For “Relational risk”, a high value signals a cost to the relationship, not a quality.

Overview: The Consistency Test

Origin & history

Cross-checking lies at the foundation of investigative interviewing techniques and of intelligence analysis. It is found in non-coercive interviewing methods (such as the British PEACEi approach) and in the critical analysis of sources, where concordance is what establishes reliability.

Definition and principle

The consistency test rests on a robust principle: a true account holds together, a fabricated one eventually contradicts itself. By varying the order, the angle and the timing of your questions, you increase the cognitive load on the liar, who struggles to maintain their version. The mechanism at work is the burden of fabricationi: the truth is stable, invention drifts. It is a technique of assessment, not of entrapment.

Concrete examples of application

Application by context

The same technique, across every negotiation settings

Context 1 / 8

Sales negotiation

A buyer who doubts a supplier's promises rephrases, on several occasions and from different angles, the lead times and guarantees that have been announced. Stable answers reinforce trust; a variation on a key deadline signals a point to be secured in writing.

How to apply it

Rephrase the key commitments at different moments; any variation becomes a point to clarify and to write into the contract.

Strengths

Distinguishes firm commitments from vague promises.

Weaknesses

A counterpart acting in good faith may contradict themselves through mere imprecision, not deception.

Context 2 / 8

Procurement negotiation

On the buyer's side: when assessing suppliers, the buyer cross-references information given verbally with the documents supplied and the answers obtained at other stages, in order to verify the consistency of the capabilities claimed (references, headcount, lead times).

How to apply it

Cross-reference verbal statements, documents and references; the discrepancies steer the supplier risk analysis.

Strengths

Secures the selection by lending reliability to self-declared information.

Weaknesses

Cross-checking takes time and requires access to independent sources.

Context 3 / 8

Labour negotiation

In collective bargaining, a representative cross-checks the figures put forward by management at different moments and across documents (accounts, memos, earlier statements) to verify the consistency of the economic argument.

How to apply it

Set the figures against one another over time; an inconsistency warrants a request for explanation or for supporting documents.

Strengths

Strengthens the credibility of the counter-argument through facts.

Weaknesses

Access to documents depends on the employer's information obligations.

Context 4 / 8

Crisis management

In a crisis unit, the information coming in through different channels is systematically cross-checked before any decision: a data point not corroborated by a second source is treated with caution, to avoid acting on erroneous information.

How to apply it

Require a second source before any major decision; distinguish the corroborated from the unverified.

Strengths

Avoids decisions based on false or biased information.

Weaknesses

Urgency may force a decision before cross-checking is complete.

Context 5 / 8

Political negotiation

An analyst cross-checks an actor's public statements against their actions and their past positions in order to assess the reliability of their commitments and anticipate their true intentions.

How to apply it

Compare rhetoric, actions and track record; recurring discrepancies illuminate the real intentions.

Strengths

Sharpens strategic anticipation through consistency analysis.

Weaknesses

An actor may sincerely change position without this being deception.

Context 6 / 8

Real-estate negotiation

A purchaser cross-checks the seller's information (year of works, absence of damage, service charges) against the surveys, the minutes of the co-ownership meetings and the official documents, in order to verify the sincerity of the declarations.

How to apply it

Set the declarations against the official documents (surveys, minutes, deeds); any divergence calls for verification.

Strengths

Reveals omissions or approximations before you commit.

Weaknesses

Some information is difficult to cross-check without dedicated expertise.

Context 7 / 8

Cross-cultural negotiation

In an international negotiation, one party cross-checks the partner's verbal commitments against the contractual documents and the customs of the country concerned, bearing in mind that the value of the spoken and the written word varies from one culture to another.

How to apply it

Cross-reference the spoken word, the written word and local custom; adjust the weight given to each according to the other party's legal culture.

Strengths

Prevents misunderstandings arising from differing contractual norms.

Weaknesses

What appears inconsistent may stem from a misread cultural code.

Context 8 / 8

Family negotiation

In an inheritance matter, an heir cross-checks another's assertions about past gifts against the bank statements, the notarial deeds and witness accounts, in order to establish the facts without any head-on accusation.

How to apply it

Rely on the objective documents (statements, deeds) rather than on assertions; let the facts speak.

Strengths

Grounds the debate in fact and reduces conflicts of interpretation.

Weaknesses

Cross-checking may reignite tensions if it is experienced as an accusation.

Counter-techniques

Spot and neutralise this technique

Negotiation is also played on defence. Here is how to recognise this technique when it is used against you, and turn it around.

Detect

The signals that give it away

  • Harmless questions that collect information
  • Flattery to make you talk
  • Silences to make you reveal your limits

Neutralise

The counters that defuse it

  • Control what you reveal
  • Answer with a question
  • Never confirm your walk-away point

Turn around

Turn it into an advantage

Feed out slanted information: what the other side thinks it knows becomes your lever.

The trap to avoid

Talking too much to "seem transparent".

In brief

  • Difficulty: Intermediate
  • Estimated effectiveness: Very high for reliability
  • Time to implement: Gradual, through successive cross-checks
  • Fields of application: Investigation, Audit, Negotiation, Risk analysis, Due diligence
  • Synonyms: Cross-checking, Cross-verification, Concordance check
  • Tags: consistency test, cross-checking, verification, PEACE, reliability

Strengths and weaknesses

The consistency test is a defensive and ethical technique par excellence: it does not entrap, it verifies. Its strength is to distinguish the firm from the vague without ever wrongly accusing, by letting the facts cross-check one another. Its limitation: an inconsistency is not proof of a lie, memory is fallible, positions evolve, hence the need not to over-interpret a mere discrepancy.

When should you use this technique?

Use it systematically in due diligence, audit, or before any significant commitment. A sound reflex: corroborate the decisive pieces of information through an independent source. Use it with measure in relationships of trust, where overly insistent cross-checking may be experienced as suspicion.

How to recognise and counter this technique

The consistency test is itself a counter-measure. To guard against it legitimately: Recognise that your account is being checked through repeated questions from several angles. Neutralise: stay precise, factual and constant; the best defence is verifiable truth. Turn it around: offer the supporting documents yourself, which turns the check into a proof of credibility.

Limits and ethics

The consistency test is ethically beyond reproach as long as it remains a fair verification. Two safeguards: do not over-interpret an inconsistency as a lie (presumption of good faith, art. 1104 of the French Civil Code), and respect the GDPRi and privacy when cross-checking personal data. Verification does not justify the unlawful or intrusive collection of information.

Variants and related techniques

A natural complement to Inconsistency Detection (no. 246). It thwarts the False Leak (no. 243), the Limited Hangout (no. 237) and the False Flag (no. 238). Close to Source Triangulation and to Due Diligence.

Going further

  • Aldert Vrij, Detecting Lies and Deceit: Pitfalls and Opportunities, 2nd ed., Wiley, 2008.
  • College of Policing (UK), Investigative interviewing, the PEACE model, official guidance.
  • Richards J. Heuer Jr., Psychology of Intelligence Analysis, CIA Center for the Study of Intelligence, 1999.

Objectives of the technique

  • Detect inconsistencies, exaggerations or bluffs in the other party's account by cross-checking their successive assertions
  • Verify the solidity of a position (figures, deadlines, constraints presented as non-negotiable) before conceding or making a counter-proposal
  • Bring out the counterpart's real constraints and priorities behind their stated postures
  • Reinforce your own credibility by showing that you are listening and cross-checking, which discourages lying
  • Test your own argument internally to ensure it withstands verification questions before you present it

Famous cases

Sales · The deadline constraint that does not survive cross-checking: A buyer insists that they absolutely must sign before the end of the month “for internal budgetary reasons”. The seller applies a consistency test: they ask several seemingly innocuous questions about the project timeline, the desired go-live date, the availability of the client's teams. The answers reveal that the roll-out is not planned before the following quarter. The urgency on display was a lever to push the price down, not a real constraint. Without accusing head-on, the seller steers the discussion back to value and declines the “last-minute” discount. A scenario representative of a common sales practice.

Judicial · Cross-checking statements during questioning: During an interview or a cross-examination, the investigator or the lawyer does not directly challenge a dubious statement. They ask a series of peripheral questions about details of time, place and sequence. The answers, set against one another and against the material evidence in the file, reveal internal contradictions that undermine the account. This cross-checking method is a classic principle of conducting an interview. A representative scenario.

Common mistakes

  • Turning the test into an aggressive interrogation: a string of questions perceived as a trap puts the counterpart on the defensive and breaks the relationship
  • Accusing of contradiction too soon: revealing a detected inconsistency before you have all the elements lets the other party retract or rebuild their account
  • Settling for a single question instead of cross-checking several assertions: an inconsistency can only be proven by setting several answers against one another
  • Confusing inconsistency with lying: a contradiction may come from mere imprecision, a lapse of memory or a misunderstanding, not necessarily from an intent to deceive
  • Failing to apply the test to your own position: an argument not cross-checked internally may collapse under the opponent's verification questions
  • Asking questions whose answer you already know in too visible a way, which betrays the manoeuvre and puts the other party on their guard

Scientific foundations

  • Chris Voss (2016) Never Split the Difference: Negotiating As If Your Life Depended On It Harper Business
  • Roger Fisher, William Ury (1981) Getting to Yes: Negotiating Agreement Without Giving In Houghton Mifflin
  • Aldert Vrij (2008) Detecting Lies and Deceit: Pitfalls and Opportunities John Wiley & Sons

Quick exercise

Test yourself before answering

Answer in your head, then reveal the solution. Memory is built through active recall.

1 Quels signaux doivent vous alerter ?
  • Harmless questions that collect information
  • Flattery to make you talk
  • Silences to make you reveal your limits
2 Quelles parades appliquer ?
  • Control what you reveal
  • Answer with a question
  • Never confirm your walk-away point

Frequently asked questions

The questions we get most

What is the "The Consistency Test" technique?

The consistency test involves cross-checking a counterpart's statements over time and from several angles to verify that they tally, and to spot revealing contradictions. Asking, at different moments, questions to which you already know the answer allows you to assess the reliability of what is said without any accusationi.

Is the "The Consistency Test" technique ethical?

It is mainly manipulation and can lastingly damage the relationship. Its main value is learning to recognise it so you do not fall victim to it.

How do you defend against "The Consistency Test"?

Talking too much to "seem transparent". The right reflex: control what you reveal.

What is the "The Consistency Test" technique based on?

NEGOCOACH does not assess the experimental validation of this technique in isolation. What we document is the grounding of its source school (Intelligence): documented school. Full detail is in the "At a glance" section of this page.

Practise with AI

Three ready-to-use prompts

Copy, paste into your assistant, replace the [brackets]. Works with ChatGPT, Claude, Gemini, Mistral, Perplexity.

Prepare

Build your plan before the meeting

You are an expert negotiation coach. Help me prepare to use the "The Consistency Test" technique in the following situation: [describe your situation]. Give me: the conditions for success, a 3-step script, my counterpart's likely objections and how to answer them.

ChatGPT Claude Perplexity

Simulate

Rehearse against an AI counterpart

Play the role of my counterpart in a negotiation. I am going to test the "The Consistency Test" technique. React realistically and with resistance, do not give in too quickly, then at the end analyse my performance and suggest 3 concrete improvements.

ChatGPT Claude Perplexity

Debrief

Analyse a past negotiation

Here is how my negotiation went: [paste the exchanges]. Analyse whether the "The Consistency Test" technique was used well, what worked, the mistakes made, and spell out precisely what I could have done better.

ChatGPT Claude Perplexity

References

Bibliography & credible sources

Founding works of the 🕵️ Intelligence school this technique belongs to.

  • Cover: You Can Negotiate Anything

    You Can Negotiate Anything

    Book

    H. Cohen · 1980

    The best-seller that democratised negotiation: everything is negotiable, provided you understand power, time and information. Accessible in tone and full of everyday examples.

  • Cover: Everything is Negotiable

    Everything is Negotiable

    Book

    G. Kennedy · 1982

    A practical guide to negotiating in daily life as in business, centred on conditional exchange and firmness on your interests. Kennedy hunts down the negotiator's "soft" reflexes.

Interviewing and analysis techniques from intelligence (HUMINT), counter-espionage and deception detection (e.g. statement analysis, the Reid technique, with its limits).

On video

See the technique in action

Videos to picture The Consistency Test and anchor it through examples.

Search for videos Examples & demonstrations

Technique map

Where this technique sits

Every technique sits within a network: what it draws on, what it combines with, where it applies, and how to defend against it.

Combines with

same family
237 The Limited Hangout (partial admission) 238 The Conversational False Flag 241 The Gray Rock Method 242 Compartmentalization (need-to-know) 243 The Controlled Leak 246 Inconsistency Detection (deception-cue analysis)

Levers engaged

biases & emotions

Fields of application

Sales negotiation Procurement negotiation Labour negotiation Crisis management Political negotiation Real-estate negotiation Cross-cultural negotiation Family negotiation

Countered by

Spot its signals, neutralise it and turn it around with the defensive playbook on this page.

See the counter-techniques

Key takeaways

  • En une phrase

    The consistency test involves cross-checking a counterpart's statements over time and from several angles to verify that they tally, and to spot revealing contradictions. Asking, at different moments, questions to which you already know the answer allows you to assess the reliability of what is said without any accusationi.

  • The right reflex

    Feed out slanted information: what the other side thinks it knows becomes your lever.

  • Never do this

    Talking too much to "seem transparent".

8.0/10 tactical potential Very high vigilance Documented school

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← Technique n°243 The Controlled Leak Technique n°246 → Inconsistency Detection (deception-cue analysis)

Related techniques

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243 The Controlled Leak 246 Inconsistency Detection (deception-cue analysis) 242 Compartmentalization (need-to-know) 241 The Gray Rock Method
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