This study aims at creating an Operating System (OS) selection framework for decision makers (DMs). Since DMs have to consider both economic and non-economic aspect of technology selection, both factors have been considered in the developed framework. The economic part of the decision process has been developed by Fuzzy Replacement Analysis. Non-economic factors ve financial figures have been combined using Fuzzy Analytic Hierarchy Process (Fuzzy AHP) approach. A real numerical application has also been demonstrated. This study developed a fuzzy AHP framework to select best OS alternative. While fuzzy AHP requires cumbersome computations, it is a more systematic method than the others are, and it is more capable of capturing a human's appraisal of ambiguity when complex multi-attribute decision-making problems are considered. This is true because pairwise comparisons provide a flexible and realistic way to accommodate real-life data. The financial side of the framework is based on fuzzy replacement analysis. The results of fuzzy replacement analysis are included into fuzzy AHP analysis. Using Fuzzy AHP concept in Replacement Analysis investment decisions in fuzzy environment results a very effective way to evaluate alternatives. Using the very same developed framework, a subjective comparison, such as the comparison of diverse operating systems, has been conducted and demonstrated to readers.