Voice of Business (VOB) - is a tool that captures the stated and unstated needs of the shareholders/business owners. Business scorecard is a very commonly used tool to capture VOB. E.g. profits, viability of business, cost reduction, dividend pay-outs, return on equity etc.
Voice of Customer (VOC) - is a research tool that captures the stated and unstated needs/requirements of the customer. Interviews, focussed group discussions, surveys, observation, warranty data, complaints are some of the ways in which VOC can be captured.
An application oriented question on the topic along with responses can be seen below. The best answer was provided by Venugopal R on 6th November 2017.