REVES’ contribution has been the dissemination of the concept of health expectancy and the harmonization of measures and strategies of computing health expectancy. This article is a brief introduction to health expectancy and the issues to be thought-about in health expectancy analysis. We will introduce the idea of health expectancy first. In subsequent sections, we are going to talk about the concepts and measures of health used in health expectancy research, information sources and strategies for computing health expectancy, and software program out there for estimating health expectancy. According to the National Cancer Institute, there are laboratory and animal studies…