The internationalisation process of companies has for long been popular to observe among researchers. Although many of the developed theories do explain this process rather accurately, we found them too general in their definition of what sorts of companies they apply to. In this dissertation we compared the internationalisation process in high-tech companies to low-tech companies in an attempt to observe differences or similarities. Was it really possible that the existing theories or at least some of them could explain this process in two so clearly different business sectors? Our conclusion is that they could not. The research of this dissertation found main differences between high-tech and low-tech companies in country focus, network-settings, and what phase their products were in at the time of their internationalisation process. As a by-product we also observed the importance of personal experience in the choice of market, which seems to be closely linked to small companies, that is thus both in high-tech and in low-tech companies.