# ISO 9921-1:1996 — Withdrawn and superseded ISO standards

For ISO 9921-1:1996, item title is Ergonomic assessment of speech communication — Part 1: Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method); status code is 9599; successor is ISO 9921:2003; withdrawn / published date is 1996-10-24, recorded from its source on 2026-08-05.

- **Identifier:** ISO 9921-1:1996 _(verified: appears in the quote below)_
- **Item title:** Ergonomic assessment of speech communication — Part 1: Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method) _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 9921:2003
- **Withdrawn / published date:** 1996-10-24 _(verified: appears in the quote below)_

## What the source says

> 17805,IS,,ISO 9921-1:1996,Ergonomic assessment of speech communication — Part 1: Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method),Évaluation ergonomique de la communication parlée — Partie 1: Niveau d'interférence avec la parole et les distances de communication pour des personnes ayant une capacité d'audition normale en communication directe (méthode SIL),1996-10-24,1,['13.180'],ISO/TC 159/SC 5,9599,,[33589],"['en','fr']",10,"<p>Provides a method for prediction of the effectiveness of speech communication in the presence of noise generated by machinery as well as in noisy environment. Parameters are the ambie

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).