The IES is an accredited Standards Development Organization (SDO) that develops its standards using American National Standards Institute (ANSI) approved procedures. The Society publishes nearly 100 varied publications including recommended practices on a variety of applications, design guides, technical memoranda, and publications on energy management and lighting measurement, many of which follow the ANSI standards process. The IES also publishes the most important reference document in the lighting profession, The Lighting Handbook, now in its 10th edition. It is the industry’s principal source for lighting knowledge. The Society, in addition, works cooperatively with related organizations on the development of programs and jointly published documents and standards.