The Cloud Computing paradigm promises a major shift in providing computing resources and enterprises are encouraged to consider migrating existing applications to this new environment. In this regard various approaches of decision support for application migration to the Cloud exist to aid decision makers with this challenging multi-dimensional issue. This Master’s thesis considers the elaboration of a recent vision of a decision support system for application migration to the Cloud taking into account decisions to be made, and tasks that support decision-making. Based on a literature investigation this work constitutes a refined version of this approach by identifying several specific decisions and their relationships to other decisions and tasks. By means of a survey these extensions have been evaluated by peers in research and professional practice. Finally, a prototype based on current web technologies has been implemented to actually make the decision support approach available to decision makers considering application migration to the Cloud.