Industrials is sector 20 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 20 is organized into three industry groups: Capital Goods, covering aerospace and defense, building products, construction and engineering, electrical equipment, industrial conglomerates, machinery, and trading companies and distributors; Commercial & Professional Services, covering commercial printing, environmental and facilities services, office services and supplies, security and alarm services, human resource and employment services, and research, consulting, data processing, and outsourced services; and Transportation, covering air freight and logistics, passenger airlines, marine transportation, rail and ground transportation, and transportation infrastructure such as airports, highways, and ports. A company, product, or service is classified into this sector when its principal business activity falls within one of these three industry groups.