Before revision:  Since transcribing audio signals is a costly process, Automatic WER Evaluation (e-WER) methods have been developed which attempt to predict the WER of a Speech system by only relying on the transcription and the speech signal features.
After revision:  Since transcribing audio signals is a costly process, Automatic WER Evaluation (e-WER) methods have been developed to automatically predict the WER of a Speech system by only relying on the transcription and the speech signal features.