The document discusses business incubators and their growth worldwide from about 200 incubators a decade ago to over 3,000 currently. It outlines some of the characteristics of incubators, including their sponsors, goals, and the benefits they provide. While incubators have increased in number, many have uneven performance and sustainability issues. The document reviews experiences from the US, China, Brazil, Korea and other countries to identify best practices, but notes that practices must be adapted to local conditions. Success depends on five interlinked factors: public policy, private partnerships, knowledge affiliations, professional networking, and community involvement.