This thesis aims to contribute to a better understanding of the business model (BM) change concept. The study purpose is achieved through developing a context-specific method and framework to measure and characterize different types of BM changes. This work promotes the importance of context-specific studies in the field of BM. It is pointed out that mature industries with slower rates of change or less complex technologies have not received enough attention in this field. Companies within these industries play a dominant role in the economic prosperity of nations and undergo different types of change. Therefore, the low-tech nature of these changes does not imply a lack of significance or complexity.The Swedish wood manufacturing industry is chosen to represent mature low-tech industries as the context of this study. This industry is currently undergoing a series of changes, brought about by both internal and external forces. Five companies active in this industry are purposefully sampled as case studies. Despite being part of the same industry, the selected case companies each undergo a varying degree or type of change.The study proposes a firm-level BM framework, which is suitable for studying organizational changes in this context. The proposed BM framework comprises three main dimensions of operational platform, offerings and market, as well as three BM components under each dimension. The changes in the BMs of case companies are studied by depicting and comparing their BMs at three points in time over a ten-year period. BM changes are measured from the two dimensions of degree and scope of change in this thesis.