Professional Service Firms (PSF), where professionals (consultants, lawyers, accountants, auditors, tax advisors, engineers ...) work, are interested in knowledge management, because their business is heavily dependent from the knowledge of their employees. Core asset is their ability to solve complex problems through creative and innovative solutions, the basis for this is their employees’ knowledge. Therefore, PSF are on the forefront of knowledge management. Experiences show that Information Technology (IT) is only one dimension of knowledge management, more important are social, cultural, and organizational dimensions.1