Short Summary: How do you change the gender culture of an organisation? Emerging out of a gender equality project of co-operation between the government departments of Columbia and Germany, this manual aims to provide some answers. It argues that structures, guidelines and physical surroundings may have to be changed, but this does not go far enough. For changes to be deep rooted, an organisation’s systems of values and beliefs, assumptions and mental models also need to be challenged. This manual presents ways to challenge these. The first part provides the concepts, the second offers specific technical tools. These tools cover: how to carry out gender analysis in an organisation, how to guide and support collective change, and how to facilitate a process of personal change. The text is geared to members of organisations in the private and public sectors, including NGOs and donors. For a copy of this publication, please write to: Division 42 -State and Economic Reform, Civil Society, Pilot Programme Gender, Fax: (+49 6196) 79-1615/1612; E-mail: marion.thompson@gtz.de