Create a context DFD, zero level DFD and basic flowchart based on the following narrative.

Ordering textbooks in a university bookstore is a massive undertaking and requires good communication and organization.

Process begins with professors selecting the textbooks and communicating that info to the store.

Once the book store receives that information from all professors, it consolidates requisition forms from all across the university and prepares purchase orders for textbook publishers. Each purchasing order has

three copies: one for the publisher, one for the purchasing department and one for the accounting department.

When publisher sends the books, the bookstore's receiving department prepares two copies of a receiving report; one is field to indicate that the goods were received, while the second is forwarded to the accounting department. The publisher sends a billing statement (invoice) directly to the accounting

department.

Once all three documents have been matched and verified, the accounting department writes a check or sends an electronic funds transfer to the publisher. The bookstore staff then sort the books based on class and stock the shelves, where the books await purchase by students.