An interpreter who walks in cold has to improvise the technical vocabulary live. An interpreter who has seen even a little of the matter in advance arrives prepared. The difference in accuracy is real, and securing it costs you almost nothing.
In short
- A short brief lets the interpreter prepare terms, names and context in advance.
- You do not need to send the whole bundle — the charge, a summary and key names go a long way.
- Preparation is a confidentiality-safe, low-effort accuracy gain.
Why advance papers change the output
Legal language is dense with terms that have no casual equivalent, and proper nouns — places, agencies, people — that are easy to mangle on first hearing. Given them in advance, an interpreter checks the right renderings, prepares dialect-specific equivalents, and is not caught improvising while the recording runs.
What is actually useful to send
You do not need to disclose everything. The high-value items are short: the charge or issue, a one-paragraph summary of the matter, the key names and places likely to come up, and any technical or medical vocabulary central to the case. For an asylum or family matter, the nature of the account and any sensitive terminology help the interpreter prepare appropriately.
Confidentiality is not a barrier
Registered interpreters are bound by a duty of confidentiality, so sharing case material for preparation is routine and safe. If you prefer, send a redacted summary rather than the full document — the preparation value is in the vocabulary and context, not in every detail.