Successfully passing the required testing at the GWDC is the first step toward IGBC approval of a product. After a product passes GWDC testing, results are forwarded to the US Forest Service (USFS) in Missoula, Montana where test results and product information are collated and reviewed. Products are not officially approved until the USFS has received all the necessary data and issued an IGBC Certification Number. Manufacturers will be notified of product approval through written correspondence from the USFS. Approved products and their assigned IGBC Certification Numbers will then be added to the list of approved products on the IGBC website. The list of approved products can be accessed through the IGBC website (www.igbconline.org).