| Siebel Application Services Interface Reference > Application Services Interfaces (ASIs)  >  About ASI Structure
 As defined earlier, an ASI is an interface whose implementation is defined by a business service or workflow. A specialized class of business services is implemented as data synchronization services. Figure 4 shows an example of the structure of the Account ASI. For information regarding specific ASIs, see Predefined Application Service Interfaces and Siebel Communications, Media, and Energy ASIs.  
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