This teaching guide accompanies the Life Expectancy at Birth poster kit, which presents statistics on life expectancy from 128 countries with populations of more than one million. The statistics relate to economic development and the changes it is bringing about in the world. Sometimes called indicators, the statistics are measures of social and economic conditions in industrial and in developing countries. The guide is intended for use with: (1) a set of six full-color pictures of people in developing countries involved in activities that will help improve the quality of their lives; and (2) a full-color poster map of the world showing related life expectancy indicators. The basic concepts covered by the materials postulate that: (1) life expectancy is generally higher in industrial countries than in developing countries; (2) there is a higher rate of infant and child mortality in developing nations; (3) as living conditions improve, those mortality rates decline; and (4) progress in improving living conditions and lowering these mortality rates varies widely throughout the developing areas of the world. As a result of using this poster kit, students should be able to read and interpret data, analyze and synthesize information on these topic areas, and develop an understanding of the relationships involved in development, mortality rates, and life expectancy. Vocabulary exercises, photograph exercises, and data table exercises are included in the guide. An achievement test with multiple choice, vocabulary matching, and essay questions is also included and may be used to evaluate students' understanding of the concepts developed in the kit. (PPB)