Consumer perception survey expert
Expert class library · Consumer class actions · Either side
Designs and runs surveys that measure what messages consumers take away from a label or advertisement and whether a challenged claim actually matters to their purchase decisions. Courts generally treat design flaws as going to weight, but they exclude surveys whose leading questions push respondents toward the sponsor's answer and strike conclusions that the survey data do not support.
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Questions this testimony turns on
- What do reasonable consumers understand a challenged label term such as "All Natural" to mean?
- What share of respondents took away the allegedly misleading message, net of a control group?
- Was the challenged claim material to consumers' purchase decisions compared with other reasons for buying?
- Was the survey universe drawn from actual or prospective purchasers of the product?
- Were the questions neutral and the stimulus close to real marketplace conditions?
Methods
- Consumer perception survey
- Materiality survey
- Open-ended and closed-ended question design
- Control stimulus design
How the testimony is attacked
- Leading questions that track the plaintiffs' theory. Defendants argue the questions steer respondents to the desired answer. In In re KIND LLC "Healthy and All Natural" Litigation the Second Circuit affirmed exclusion of the plaintiffs' survey because its key question was leading and its response options were written around the plaintiffs' theory of liability.
- Conclusions not drawn from the survey data. Opponents attack opinions that go beyond what respondents were asked. In Townsend v. Monster Beverage the court struck the plaintiffs' survey expert's conclusions about what purchasers relied on and about contradictory label statements because they were disconnected from his data.
- Wrong universe of respondents. Challengers argue that surveying consumers of a product category is not the same as surveying purchasers. The Townsend court found the assumption that energy drink consumers were purchasers to be unsupported speculation.
- Missing control, unrepresentative sample, or unrealistic stimulus. Parties routinely attack survey design choices. The Townsend court held that such methodological criticisms of both sides' surveys went to weight rather than admissibility.
- Failure to ask about the specific claim at issue. Plaintiffs attack defense surveys that measure general purchase reasons without testing the challenged message. In Mullins v. Premier Nutrition the court admitted the defense survey despite that gap and alleged coding errors, leaving the flaws for cross-examination.
What the public record shows
Courts have filed at least 13 opinions since 2015 that discuss this class of testimony and cite Daubert or Rule 702, as of October 2, 2026. Three that show how courts handle this class of testimony:
| Outcome | Case | Court | Year | Why |
|---|---|---|---|---|
| Excluded | In re KIND LLC "Healthy and All Natural" LitigationNo. 22-2684 | 2d Cir. | 2024 | The Second Circuit affirmed exclusion of the plaintiffs' consumer perception survey because its central question was leading and biased toward the plaintiffs' theory and so could not supply an objective measure of how reasonable consumers read "All Natural." |
| Limited | Townsend v. Monster Beverage Corp.303 F. Supp. 3d 1010 | C.D. Cal. | 2018 | The court struck the plaintiffs' survey expert's conclusions about purchaser reliance and contradictory label statements as speculative and unconnected to his survey data, but held that the attacks on his universe, sampling, control, and question design went only to weight. |
| Admitted | Mullins v. Premier Nutrition Corp.178 F. Supp. 3d 867 | N.D. Cal. | 2016 | The court denied the motion to exclude the defense consumer survey on why buyers purchased the product, finding that criticisms of its question design and coding were not so serious as to require exclusion and could be exposed on cross-examination. |
Each case links to the free opinion text on CourtListener.
In federal court: amended Rule 702
In federal court, since December 1, 2023, Rule 702 says expressly that the party offering an expert must show the court it is more likely than not that the testimony meets each requirement: that it rests on sufficient facts or data, uses reliable methods, and reflects a reliable application of those methods to the case. Questions about the basis of an opinion are no longer automatically matters of weight for the jury. For how the circuits have applied the amendment, see the Rule 702 tracker, which follows each court of appeals; for what that means for preparing or attacking this class of expert, see the guide on amended Rule 702.
Related classes
- Conjoint survey damages expert
- Defense survey rebuttal expert
- Trademark likelihood-of-confusion survey expert
- Hedonic regression price-premium economist
Guides
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Updated October 2, 2026. How this page is built: rulings are found by searching court opinions on CourtListener. The summaries are written by AI working from the full text of each opinion, and every citation and link is checked automatically. Outcomes are labelled by what the court did with the expert’s testimony. No individual expert is named. This page summarises public decisions for orientation and is not legal advice; read the opinion before relying on any ruling. Spotted an error? Tell us.