Abstract: The invention provides a method of speech recognition comprising the steps of receiving a signal comprising one or more spoken words, extracting a spoken word from the signal using a Hidden Markov Model, passing the spoken word to a plurality of word models, one or more of the word models based on a Hidden Markov Model, determining the word model most likely to represent the spoken word, and outputting the word model representing the spoken word. The invention also provides a related speech recognition system and a speech recognition computer program.