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Moving existing legacy systems to cloud platforms is a difficult and highcost process that may involve technical and non-technical resources andchallenges. There is evidence that the lack of understanding and preparednessof cloud computing migration underpin many migration failures in achievingorganisations goals. The main goal of this article is to identify the mostimportant challenging activities for moving legacy systems to cloud platformsfrom a perspective of reengineering process. Through a combination of abottom-up and a top-down analysis, a set of common activities is derived fromthe extant cloud computing literature. These are expressed as a model and arevalidated using a population of 104 shortlisted and randomly selected domainexperts from different industry sectors. We used a Web-based surveyquestionnaire to collect data and analysed them using SPSS Sample T-Test. Theresults of this study highlight the most important and critical challenges thatshould be addressed by various roles within a legacy to cloud migrationendeavour. The study provides an overall understanding of this processincluding common occurring activities, concerns and recommendations. Inaddition, the findings of this study constitute a practical guide to conductthis transition. This guide is platform agnostic and independent from anyspecific migration scenario, cloud platform, or an application domain.Keywords. Cloud Computing, Legacy Systems, Cloud Migration, Cloud MigrationProcess

Challenges in migrating legacy software systems to the cloud an empirical study