Estill Voice International™ (EVI) is pleased to provide several certification opportunities for those who would like to continue to develop and refine their understanding, execution, and promotion of Estill Voice Training™. Jo Estill believed that everyone has a beautiful voice and that, given adequate instruction, this voice can be discovered. EVI seeks to make her vision a reality in all regions of the world. With its conviction that Estill Voice Training™ is the premier source for vocal training and rehabilitation, EVI's certification program promotes consistent and high calibre delivery of Jo Estill's innovative concepts and exercises throughout the world. Certification levels, along with additional honors and privileges, are detailed in this manual.