1. A method of assigning a confidence level to an axiom extracted from a text of a transcription of a voice recording; receiving, at a computer device, the text of the transcription; comparing, using the computer device, every word from the text to a customer specific dictionary and a dictionary of common language words; determining a number of inaccurately spelled words in the transcription based on the comparing; assigning, using a Gaussian distribution, 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; gathering, using the computer device, external information related to words in the text by retrieving a set of axioms that further define the words in the text of the transcription from a set of sources, each axiom in the set of axioms comprising a proposition that is regarded as being at least one of established, accepted, and self-evidently true; determining a confidence level of each source of the set of sources; and assigning a confidence level to each axiom of the set of axioms based on a combination of the confidence level of the set of sources and the accuracy of the text estimated based on the assigned confidence level.