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This Concept Map, created with IHMC CmapTools, has information related to: Chapter 2 System Models 3, forms of transparency hide the failure and recovery of a resource Failure, forms of transparency hide that a resource may be shared by several competitive users Concurrency, forms of transparency hide whether a software resource is in memory or on disk Persistence, forms of transparency hide where a resource is located Location, Middleware Complex software. Development platform (API) not complete system. Functionality is hard to understand. Cons, Middleware Reduce number of interfaces: Clients see only one system i.e. the middleware; Centralizes control. Functionality widely available to all clients. It allows to implement functionality that otherwise would be very difficult to provide. Pros, forms of transparency hide differences in data representation and how a resource is accessed Access, forms of transparency hide that a resource is replicated Replication, forms of transparency hide that a resource may move while in use Relocation, forms of transparency hide that a resource may move to another location Migration