The research area of this book is the effects of digital transformation on corporate management and the associated business processes of corporate planning, forecasting and the resulting decision-making processes. In this research it could be proven that the from the digital transformation resulting possibilities of data science do not only significantly improve the level of information of controlling and management, but also lead to a changed decision-making behavior. The business case used in this research is the decision making behavior of a company in the marina industry in Croatia. The possibilities of data science associated with the digital transformation could be used to develop meaningful prediction models as a basis for decision-making. In this research it is used 38,000 data sets by a marina company which made it possible to develop prediction models with optimal predictive power and prediction confidence.