expert witness

noun · Sachverständiger

The expert witness of English procedure maps to the Sachverständiger, but in German law the Sachverständiger is not a witness at all: he is a means of evidence of his own kind, §§ 402 ff. ZPO, selected and appointed by the court and replaceable. The literal rendering sachverständiger Zeuge names a different figure, the witness under § 414 ZPO who perceived facts through special expertise.

Which translation, when

eigenes Beweismittelthe German figure: the Sachverständigenbeweis of §§ 402 ff. ZPO is a distinct means of evidence; the court selects and appoints the Sachverständiger, § 404 ZPO, can replace him with another, directs his work, § 404a ZPO, and he supplies expertise and experience for judging facts, not perceptions of the individual case; he can be rejected for bias on the grounds that apply to a judge, § 406 ZPO.

sachverständiger Zeugethe trap: § 414 ZPO gives the literal phrase to a different figure, the person who perceived past facts or conditions through special expertise, the treating doctor being the classic case; that person is a witness, the witness rules apply, he is irreplaceable because his perceptions are his own, and he cannot be rejected for bias the way a Sachverständiger can; the function decides, not the label a court or a text attaches.

Partei- und Gerichtsgutachtenthe party side: the English expert witness is retained and instructed by a party, with duties to the court layered on top, while the German Sachverständiger of §§ 402 ff. ZPO is the court’s helper; a privately commissioned Parteigutachten is treated as qualified party submission, not as Sachverständigenbeweis, so the two systems assign the expert to different sides of the room.

Why

The expert witness translates as Sachverständiger, and the point of the entry is that the German word does not name a witness. German procedure treats the Sachverständigenbeweis of §§ 402 ff. ZPO as a means of evidence of its own kind: the court selects and appoints the Sachverständiger, § 404 ZPO, may put another in his place, directs his activity, § 404a ZPO, and takes from him expertise, experience and evaluation, not perceptions of the individual events; consistently, he can be rejected for bias on the grounds that apply to a judge, § 406 ZPO. The witness is the opposite figure, irreplaceable because he reports his own perceptions. Between the two sits the trap of the literal rendering: § 414 ZPO calls sachverständige Zeugen those persons who perceived past facts or conditions through special expertise, the treating doctor being the classic example, and for them the rules on witness evidence apply; such a person is a witness, cannot be exchanged, and cannot be rejected for bias the way a Sachverständiger can. The commentary line is that the function decides, not the possibly wrong label used by the court, and a translation should hold to the same rule: an expert engaged to evaluate is a Sachverständiger, a professional who happened to perceive the facts is a sachverständiger Zeuge. One more system difference deserves care: the English expert witness is retained by a party, with overriding duties to the court, while the German court appoints its own expert, and a privately commissioned Parteigutachten counts as qualified party submission rather than as Sachverständigenbeweis. So the safe rendering is Sachverständiger, with sachverständiger Zeuge reserved for the § 414 ZPO figure.

Typical mistakes

The Sachverständiger of §§ 402 ff. ZPO is a means of evidence of its own kind, court-appointed and replaceable, so rendering expert witness as sachverständiger Zeuge names the wrong figure.
The sachverständiger Zeuge of § 414 ZPO is a witness who perceived facts through special expertise, governed by the witness rules and not rejectable for bias, so the two figures must not be merged; the function decides, not the label.
A privately commissioned expert report is qualified party submission, a Parteigutachten, not Sachverständigenbeweis, so the party-retained English expert must not be presented as the court’s expert.

What matters

Rendering a passage on experts in court, the translation should use Sachverständiger for the evaluating expert, reserve sachverständiger Zeuge for the person who perceived the facts through special expertise, § 414 ZPO, and keep the party-commissioned report apart as Parteigutachten.

Authority

§ 402 ZPO
§ 414 ZPO

What the machine misses

Machine output renders expert witness literally as sachverständiger Zeuge, which under § 414 ZPO names a different figure, the witness who perceived facts through special expertise. That merges the court-appointed, replaceable, bias-rejectable Sachverständiger of §§ 402 ff. ZPO with an irreplaceable witness under the witness rules. The rendering misassigns the means of evidence and the procedural rights that attach to it.

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Examples

to hear an expert witness	einen Sachverständigen vernehmen
the expert opinion	das Sachverständigengutachten
a witness testifying from special expertise	ein sachverständiger Zeuge
challenge of the expert for bias	Ablehnung des Sachverständigen wegen Befangenheit

More notes on these sections

witness Zeuge