Here are the answers to the questions in 30 words each:
1. The first period in the Age of Computers in libraries was that of library automation.
2. The second period was that of library digitization.
3. Library automation made library processes like circulation, cataloguing and serials control more efficient using computers.
4. Library digitization involved storing some library content in digital form and making it accessible through computer systems.
5. While library automation is well established, library digitization is still in a developing state with an uncertain future.