UML - State diagram

Hello Everyone!
Here is an example of an State Diagram of a NCIT subscription model.

Problem Statement -

Above 300 journals are subscribed by national center of information technology NCIT with periodicity varying from half yearly to monthly. Most journals are quarterly. The journals mostly come from abroad by surface mail and take approximately 3 months to reach NCIT from the date of dispatch. Subscription renewal has to be done promptly to avoid missing issues due to delayed payment. Scientific officer subscribes for the journal. When the journal is received, scientific assistant updates the library. If the journal is not received within time a request is sent for reissue. If the subscription is over then a request is sent for renewal. For updating the library, the scientific officer checks the invoices, updates the journal information and sends the details to the account section.

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