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get_next_item is used when communicating with the sequence. it unblocks the start_item(req) in the sequence. 

get is used for communication with other components that are connected with the driver via tlm fifo port

nand gate truth table 

a  b  y 

0  0  1

0  1  0

1  0  0

1  1  0

timing violations like propagation delay, input synchronicsation and output synchronisation

1. Reusability

2. Maintainability

3. Standard methodology makes it easier to understand the data flow for new members

4. Built-in code helps to do things in a standard way and also avoids minor mistakes

5. Scalability increases