The 2023 amendment to Rule 702 clarified that the proponent must establish admissibility requirements by a preponderance.

An accident reconstruction expert analyzes physical evidence, vehicle data, and scene measurements to determine how a collision or incident occurred.

An analytical gap is a disconnect between the data an expert relies on and the conclusion drawn from it.

Battle of the experts describes litigation where opposing qualified experts reach opposite conclusions on the same evidence.

A billing and coding expert analyzes medical charges for accuracy, necessity, and conformity to coding standards.

A biomechanical expert analyzes the forces in an event and whether they were capable of producing the claimed injury.

A consulting expert advises counsel without testifying, and their identity, opinions, and work are generally protected from discovery.

A court-appointed expert is a neutral expert selected by the court rather than by a party.

Cumulative expert testimony is duplicative opinion from multiple experts on the same subject, subject to exclusion.

A Daubert hearing is an evidentiary proceeding at which the court evaluates the admissibility of expert testimony.

A Daubert motion asks the court to exclude an opposing expert's testimony as unqualified, unreliable, or unhelpful to the factfinder.

The Daubert standard requires trial judges to act as gatekeepers, admitting expert testimony only if it rests on reliable principles reliably applied to...

Draft report protection shields expert draft reports and most attorney-expert communications from discovery.

An economic damages expert quantifies financial losses such as lost earnings and future care costs, typically reducing future amounts to present value.

An engineering expert applies engineering principles to questions of design, failure, construction, or safety.

An epidemiologist analyzes disease patterns in populations, providing the general causation evidence in toxic tort cases.

Expert compensation is the fee arrangement with a testifying expert, which is discoverable and subject to cross-examination.

The expert designation deadline is the date by which a party must identify its experts and serve required disclosures.

Expert file production is the disclosure of an expert's working file, subject to draft and communication protections.

Expert qualifications are the knowledge, skill, experience, training, or education establishing a witness may testify as an expert.

An expert report is the written disclosure a retained expert must provide, stating all opinions, their bases, the data considered, qualifications, and...

An expert witness is a person qualified by knowledge, skill, experience, training, or education to offer opinion testimony on matters beyond common...

A fire origin and cause expert determines where a fire started and what ignited it.

The fit requirement demands that expert testimony be sufficiently tied to the case facts to assist the trier of fact.

A forensic accountant analyzes financial records to quantify economic loss, trace funds, or evaluate financial claims.

The Frye standard admits expert testimony only if the underlying methodology is generally accepted in the relevant scientific community.

The gatekeeping function is the trial court's obligation to ensure expert testimony is both relevant and reliable before admission.

A human factors expert analyzes how people perceive, decide, and act, addressing warnings, design, and reaction time.

A hybrid witness testifies to both percipient facts and expert opinions, complicating disclosure and examination.

An industrial hygienist assesses workplace exposures, reconstructing the concentrations a worker encountered.

Ipse dixit describes an expert opinion resting on the expert's assertion rather than on identifiable reasoning.

A life care planner projects an injured person's future medical and support needs and their costs, producing the foundation for future damages claims.

A materials considered list identifies everything an expert reviewed in forming opinions, which is discoverable.

A metallurgical expert analyzes metal components to determine failure mode, cause, and manufacturing quality.

The net opinion rule excludes expert testimony offering conclusions without the factual and reasoning basis supporting them.

A neuropsychologist assesses cognitive function through standardized testing, addressing brain injury claims.

A non-retained expert testifies to expert opinions formed outside litigation, subject to lighter disclosure requirements.

A nursing standard of care expert opines on whether nursing practice met the applicable standard.

A premises safety expert opines on whether property conditions and maintenance met applicable safety standards.

A radiologist retained for expert review independently interprets imaging studies rather than relying on the treating radiologist's report.

A rebuttal expert responds to opinions disclosed by an opposing expert rather than offering affirmative opinions.

Reliable methodology is the requirement that expert opinion rest on sound principles and methods properly applied.

Reliance materials are the specific facts, data, and documents an expert depended on in forming opinions.

A retained expert is engaged specifically to provide expert testimony, subject to full written report disclosure.

Rule 26(a)(2) disclosure is the required identification and description of testifying experts and their opinions.

Rule 702 is the federal rule governing expert testimony, requiring that opinions rest on sufficient facts, reliable methods, and a reliable application of...

A standard of care expert testifies to the professional standard applicable to a defendant and whether the defendant's conduct met it.

A supplemental expert report corrects or completes a prior report, distinguished from an untimely new opinion.

A toxicologist evaluates the effects of chemical exposure, addressing dose, mechanism, and whether exposure could cause the claimed harm.

A vocational rehabilitation expert assesses a claimant's employability and earning capacity after injury.

A warnings expert evaluates the adequacy of product warnings and instructions against applicable standards.