Services have become the biggest economic sector and are increasingly subject to fiercer international competition. This doctoral thesis tries to answer the question, whether the industrialization of IT services shows positive effects on quantitative corporate success, e.g. for mainly reducing fixed costs. The economic impact of IT industrialization has hardly been investigated, therefore, this thesis tries to close this gap by the aid of a cumulative approach. First, it introduces existing research and a definition of IT services industrialization. Second, the state-of-the-art for determining IT investment profitability is evaluated. Third, the effect of industrialization on a specific services category, IT projects, is measured by an empirical case study with data from 80 projects stemming from a professional IT consulting company in Central Europe. Fourth, recommendations for service providers and their clients are derived from the findings. Results indicate a positive effect of services industrialization which is comparable to the historical industrialization of goods production, however, depending on side conditions. IT investments, IT services being a subcategory, have to be thoroughly analyzed on the business process level. Firm level investment measures can help to determine profitability, if they are in line with the strategic purpose of the respective investment. The industrialization of IT projects is conducive to positive quantitative project performance, if project governance structures and risk settings allow for it. Enterprises can benefit from the phenomenon of IT services industrialization, if they draw on the lessons of historical industrialization, reconsider their market positioning as far as IT is concerned and understand the provision of these services as a supporting function of final customer value.