Abstract: Working with the reuse of knowledge is a widespread effort in many organizations, a common approach being to collect and make use of experience. In the Swedish Armed Forces (SwAF), this activity is not handled in an organized way, as a methodological and systematic approach to handling experience, transforming experience into Proven experience and finally reusing it in the organization is lacking. This paper is concerned with practitioners' efforts to share and reuse knowledge for the purpose of improving their professional competence. The aim is to develop and provide a method for transforming experience into Proven experience. A solution to this complicated problem could reduce repetition of mistakes and facilitate for of high-quality Proven experience, not just in SwAF but also in other organizations.