Developing a Municipal Traffic and Transport Plan (MTTP) is a long lasting and complex process. Many different disciplines are involved, as well as many stakeholders. The process may take more than two years. The larger municipalities in the Netherlands mostly develop their own plans. But for the medium sized and smaller municipalities private consultancies play a major role in the development of the MTTPs. This article describes a case study concerning improving the MTTP development process in such a consultancy. The company did reasonably well in the field, but could do better: a part of the knowledge present in the company wasn’t shared well enough, especially the exchange of knowledge and experience between senior and junior consultants which needed improvement. To improve the sharing, a wiki was developed. In interaction with the consultants a structure was proposed, allowing them to add the information they valued relevant for the development of the MTTPs. The wiki appeared...