Investing in information technology (IT) is crucial for firms to stay competitive. This thesis explores how firms make decisions about IT investments. It discusses the process of decision-making, different methods and models used, and practical cases from postgraduate students. The analysis reveals a gap between theory and practice in decision-making for IT investments. Key criteria and important aspects for making better decisions in the future are identified. The study emphasizes the significance of considering individual circumstances when making decisions about IT investments.