This document provides requirements and recommendations for the design of permanent booths for simultaneous interpreting in new or existing buildings. This document also ensures the usability and accessibility of booths for all interpreters. This document should be used in conjunction with ISO 20109, Simultaneous interpreting Equipment Requirements, which contains requirements and recommendations for the equipment necessary for simultaneous interpreting. For requirements and recommendations for permanent booths which do not have a direct view to a conference room, see ISO 17651-3, Simultaneous interpreting The interpreter s working environment Part 3: Requirements and recommendations for interpreting hubs.