What information is provided by each level of the model and how is it used in either database design or if not for what other purpose is it used?

Techarati, Inc. is a medium-sized computer retail sales company
serving both individual and business customers. Based upon a
discussion with the owner at Techarati, you have prepared the
following summary of the Revenue Cycle Techarati sells computers to
both individual and business customers. Customers send a Customer
Order document to Techarati’s Sales Department. When a Customer
Order is received, the Sales Department checks inventory
availability via the inventory database. If the inventory to fill
the order is not available, the Sales Department prepares a
Backorder document (2 copies). One copy is sent to the Purchasing
Department and the other copy is filed alphabetically with the
Customer Order in the Sales Department. If the inventory for the
order is available, the Sales Department prepares a Sales Order (4
copies). One copy of the Sales Order is sent to the customer. One
copy is filed alphabetically in the Sales Department with the
Customer Order. The remaining two copies of the Sales Order are
sent to the Warehouse. In the Warehouse, one copy of the Sales
Order serves as a picking ticket to release the stock and the other
copy serves as a packing slip. A warehouse employee picks the goods
and completes the order by shipping the order to the customer. A
copy of the Sales Order is included with the order as a packing
slip. The Warehouse then prepares a Shipping Confirmation (2
copies) which is forwarded to the Billing Department and files one
copy of the Shipping Confirmation in the Warehouse by date along
with the Sales Order. When the Billing Department receives the
Shipping Confirmation, the inventory and accounts receivable
database files are updated and an Invoice is generated (2 copies).
One copy of the Invoice is sent to the customer, while the other
copy of the Invoice is filed in the Billing Department by customer
name with the Shipping Confirmation. Additionally, a weekly AR
Aging report is generated from the accounts receivable database and
forwarded to the Controller.
Question:
Briefly describe the purpose of each level of the REA Ontology
created in Part I. What information is provided by each level of
the model and how is it used in either database design or if not
for what other purpose is it used?

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