This Technical Report advises on methods for determining the performance of speech-technology systems (automatic speech recognizers, text-to-speech systems and other devices that make use of the speech signal) and on selecting appropriate test procedures. It deals with the testing and assessment of speech-related products and services, and is intended for use by specialists active in the field of speech technology, as well as purchasers and users of such systems. Human-to-human speech communication is not included in this Technical Report but is covered by EN ISO 9921.#,,#