The 2007 version of the ANSI/ESD S20.20 was updated in 2014. The ESDA now offers a guided presentation of the changes on their website HERE
The JAN/FEB edition of the ESDA’s Threshold details the changes – Significant Changes Made From the 2007 Version To The 2014 Version Of ANSI/ESD S20.20
To download a complimentary .pdf of ANSI/ESD S20.20-2014, go to the ESD Association web site www.ESDA.org.