A self-analysis tool for entrepreneurs, called the sustainability scan, has been developed from a study of the literature and existing sustainability measurement tools. The scan systematically offers all the facets of sustainable management (in relation both to themes and management aspects). Completing the scan enables the entrepreneur to obtain a picture of his business and to identify areas for improvement. The scan has been tested by five entrepreneurs and further sharpened on the basis of their comments. ; Op basis literatuuronderzoek en bestaande duuzaamheidsmetingtools is een instrument voor zelfanalyse door bedrijven ontwikkeld: de Duurzaamheidsscan. De Scan biedt alle facetten van duurzaam ondernemen (zowel qua thema's als qua managementaspecten) op een systematische manier aan. Door de Scan in te vullen, krijgt de ondernemer een spiegel voorgehouden. Op basis hiervan kunnen aangrijpingspunten voor verbetering worden geïdentificeerd. De Scan is door vijf bedrijven getest en naar aanleiding van hun commentaar verder aangescherpt. A self-analysis tool for entrepreneurs, called the sustainability scan, has been developed from a study of the literature and existing sustainability measurement tools. The scan systematically offers all the facets of sustainable management (in relation both to themes and management aspects). Completing the scan enables the entrepreneur to obtain a picture of his business and to identify areas for improvement. The scan has been tested by five entrepreneurs and further sharpened on the basis of their comments.