That the Dutch love to support their national football team (called Orange, after the royal colors) during the World Cup in South Africa, is known. But how serious is this Orange fever? When is the climax? And how is this fever driven? In order to provide answers to this and other questions, the Orange Index has been developed since 2004. With this study, which is conducted in several waves before, during and after the tournament, the development of the Orange experience (in terms of maturity and fierceness) in The Netherlands is measured (among persons 16+). Resulting in an overall Orange fever score of the Dutch nation. For more information and a free copy of the over view please contact Lex de Witt at trendbox at netherlands@research-alliance.com.