Estimating Systems, Inc.'s construction cost estimating software, is used by commercial and government construction offices around the world to create estimates for facilities construction and maintenance. was specifically developed for use with Job Order, Delivery Order and SABER contracts. The software allows estimators to compare and contrast construction bids, providing a standard basis for contract negotiations. is GSA approved for government purchase, and is available for use in all Windows operating systems. Originally designed by R.S. Means Company, Inc., makes full and unchanged use of R.S. Means' Cost Data. The R.S. Means database includes over 40,000 construction line items containing labor, material and equipment costs, adjusted by city, for over 700 cities in the US and Canada. ESI is the leading reseller of R.S. Means electronic cost data.