Which method allows disclosure of underlying data and reasons with an expert opinion?

Which method allows disclosure of underlying data and reasons with an expert opinion?

• A. Only in a separate pretrial report.
• B. Only upon a court order.
• C. The data and reasons must be kept confidential.
• D. The data and reasons may be disclosed in response to a hypothetical question or otherwise.

Answer: (D)

The core idea is that an expert’s opinion can be supported by the data and reasoning that underlie it, and there are flexible ways to reveal that basis to the court. Using a hypothetical question is a standard, controlled way to have the expert walk through the data, calculations, and steps that led to the conclusion, showing how the opinion was formed. The phrase "or otherwise" broadens this so the data and reasons can be disclosed through other appropriate avenues—such as responding to a party’s inquiry, during cross- or direct examination, or in a report if warranted—so the opposing side and the fact-finder can evaluate the reliability of the opinion. The other options are too restrictive: requiring disclosure only in a separate pretrial report would limit timely access; requiring disclosure only by court order assumes secrecy unless ordered; insisting the data and reasons stay confidential would prevent the necessary scrutiny of the expert’s basis.

The core idea is that an expert’s opinion can be supported by the data and reasoning that underlie it, and there are flexible ways to reveal that basis to the court. Using a hypothetical question is a standard, controlled way to have the expert walk through the data, calculations, and steps that led to the conclusion, showing how the opinion was formed. The phrase "or otherwise" broadens this so the data and reasons can be disclosed through other appropriate avenues—such as responding to a party’s inquiry, during cross- or direct examination, or in a report if warranted—so the opposing side and the fact-finder can evaluate the reliability of the opinion.

The other options are too restrictive: requiring disclosure only in a separate pretrial report would limit timely access; requiring disclosure only by court order assumes secrecy unless ordered; insisting the data and reasons stay confidential would prevent the necessary scrutiny of the expert’s basis.