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In a multitenancy cloud environment, multiple vendors, using the same infrastructure, can access and use an application. The application design thus must distinguish between customers to ensure they can’t share or see each other’s data. The articles in this special issue analyze many of the important issues in a multitenancy cloud environment, including the need for logical data model architectures, the difficulty of merging heterogeneous resources offered by different domains, and the need to secure services on the cloud.