Materials is sector 15 of the Global Industry Classification Standard (GICS), the industry taxonomy developed in 1999 by MSCI and Standard & Poor's for classifying public companies by their principal business activity. Under GICS, sector 15 is organized as a single industry group, also named Materials, divided into five industries: Chemicals; Construction Materials; Containers & Packaging; Metals & Mining; and Paper & Forest Products. Together these cover companies engaged in commodity and specialty chemicals, building materials, metal and plastic packaging, mining and metals production including aluminum, copper, gold, precious metals, silver, and steel, and forest and paper products. A company, product, or service is classified into this sector when its principal business activity falls within one of these five industries.