When developing businesses there is often a need to rely on instructions such as methods. Methods are among other things experiences from previous development work. Within an organisation there usually exists a variety of methods and method like work forms that different actors have experience of. When performing development work one intends to achieve certain result by using methods. Therefore, there is a need to ensure that the used method also harmonises with the goal for the change work. One way to create such a method is to perform method integration, where several methods can be used as candidates on different levels when forming the "new" method. The method parts can be treated so that they form a synthesis or just a concatenation in the "new" method. When performing such method integration three supplementary approaches can be usedwill be discussed: modeltheory, practice and internal based method integration. A fruitful way to create a well grounded integrated method is to let these three approaches interact with each other during the method integration process. This paper focuses on experiences from the application of these three supplementary approaches. The paper also treats the problem of reconstruction of tacit method knowledge.