Information Services:

In that part we shall discuss eight types of information services: 

• Current Awareness Service (CAS) 
• Selective Dissemination of information (SDI)
• Service Indexing and Abstracting Services 
• Literature Searching Service 
• Reference Service 
• Translation service 
• Document Delivery Service 
• Reprography Service 

The first four services are basically bibliographical services, which guide the users to the documents wherein the required information is likely to be available. These services can be groped into current information services and retrospective information services. As the names suggest, the current awareness service as well as its variant form 'selective dissemination of information' fall in the first category. Indexing and abstracting services, although to an extent useful as current awareness tools, are basically meant for providing retrospective