8. The method of claim 5 further comprising a training step for generating the validity model.
9. The method of claim 8 wherein the training step comprises: receiving a training interaction; performing audio analysis on the training interaction for obtaining text; segmenting the text into context units; extracting a training sentiment candidate context unit from the context units; extracting features from the training sentiment candidate context unit or from the audio signal; receiving tagging data for the training sentiment candidate context unit; and generating a model using the training sentiment candidate context unit and the tagging data.