The product can thus be designed to prompt for cues if the desired accuracy isn't reached. Of course, designing a product where recognition errors don't result in frustration is strongly advised. For example, the product uses a hand held phone that is held close to the face. For example, the end of a question signals that the user is supposed to speak and that the recognizer is expecting a response. For speaker independent Sensory recommends a maximum of 14 words, for speaker dependent it increases to 60.
Verbal interaction is used to clarify ambiguous recognition words.