EIG specializes in applying research-based best practices to improving customer service through great voice user interface design. Our designs span touch tone, speech, and natural language user interfaces. We constantly subject our design practices to qualitative video usability tests and large-scale "Live Wizard" tests involving thousands of callers and stringent statistical analysis. Over the last 15 years, EIG has completed extensive research on telephone voice user interface design best practices, and has helped improve IVR and speech recognition systems for more than 100 of the Fortune 500.