Understanding the cost of capital is vital for investor relations executives. Ways to calculate the cost of capital by project, business unit and at the corporate level are found in "The Search for Value: Measuring the Company's Cost of Capital." By Michael Erhardt, a finance professor at the University of Tennessee, the book is written for both experienced financial executives as well as for investor relations executives with a communications background. To order a copy for $35, call Harvard Business Press at 617/495-6700.