| LS | Title | From | To | Approval date |
| IEC TC 25 WG 6-IEC 25-478 | LS on invitation to consider to transform the new (revised) Rec. X.th4 from "Related Text" to IEC 80003-4 Biology into a twin-text between IEC Metrologists and ITU-T/SG 17/Q.9. The task is Standardizing Optimal Safety and Security in Telebiometrics [from IEC/TC 25/WG 6] | IEC TC 25 WG 6 | SG17; | 2013-12-19 |