1. A method of assigning a confidence level to an axiom extracted from a text of a transcription of a voice recording; receiving the text of the transcription; comparing at least one word from the text to at least one of a customer specific dictionary and a dictionary of common language words; determining a number of inaccurate words in the transcription based on the comparing; assigning a confidence level to the text of the transcription based on the determining; estimating an accuracy of the text based on the assigned confidence level; extracting the axiom associated with a part of the text of the transcription from a source, the axiom comprising a proposition that is regarded as being at least one of established, accepted, and self-evidently true; determining a confidence level of the source; and assigning a confidence level to the axiom based on a confidence level of the source and the accuracy of the text.