The purpose of this Information Aid is to alert school officials to changes and revisions in the Consumer Price Index (CPI), to familiarize them with differences between the former CPI and the new and revised indexes, to demonstrate how the U.S. Bureau of Labor Statistics (BLS) computes changes in the CPI, to indicate appropriate uses of the CPI, and to describe available sources of information. The CPI is based on prices of goods and services that people buy for day-to-day living. The CPI can serve school administrators in estimating changes in employee purchasing power when negotiating salary agreements. The Producer Price Indexes are based on the prices of commodity goods in primary markets. These indexes can help school administrators in estimating changes in the costs of many commercial goods and services needed by school systems. There are four methods of using both indexes to project cost and price increases--assuming a simple percent change, assuming an average percent change, assuming a trended percent change, or accepting the stated governmental goal. School administrators who need to stay abreast of the latest developments in the CPI should consult the "Monthly Labor Review" and monthly BLS releases. (Author/JM)