| Course | AC442 Data Management and Analysis |
|---|---|
| Unit | Unit 3 |
| Paper type | Entity relationship diagram |
| Length | About 560 words, 5 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | BS in Accounting |
| Updated | October 2026 |
Free sample paper for AC442 Unit 3
Eleven Boxes for a Revenue Cycle: A Unit 3 REA Entity Relationship Diagram for a Winery
[Student Name]
Purdue University Global
AC442: Data Management and Analysis
Unit 3 Entity Relationship Diagram
[Instructor Name]
[Date]
Cobble Hill Estate Winery and its processes are composite; the articles and textbook cited are real.
The Diagram, Box by Box
Notation: UML class boxes, multiplicities written as 0..* or 1..1 at each end, primary keys underlined (shown here as PK) and foreign keys marked FK.
Resources (left):
1. WINE: SKU (PK), varietal, vintage, bottle size, list price. The SKU combines varietal, vintage and bottle size.
2. CASH ACCOUNT: account number (PK), bank, account type.
Events (center):
3. SALES ORDER: order number (PK), order date, customer ID (FK), employee ID (FK).
4. SALE: sale number (PK), sale date, order number (FK), customer ID (FK), carrier ID (FK).
5. CASH RECEIPT: receipt number (PK), receipt date, amount, customer ID (FK), cash account number (FK).
6. RETURN: return number (PK), return date, sale number (FK), employee ID (FK).
Agents (right):
7. CUSTOMER: customer ID (PK), name, type (walk-in guest, club member or distributor), state.
8. EMPLOYEE: employee ID (PK), name, role.
9. CARRIER: carrier ID (PK), name.
Associative entities:
10. SALE LINE: sale number and SKU (composite PK, both FK), quantity, unit price.
11. CASH APPLICATION: sale number and receipt number (composite PK, both FK), amount applied.
Notes on the Relationships
SALES ORDER to SALE, 1..1 to 0..*: the club narrative's sentence 4 holds a shipment when a card fails, so an order may produce no sale yet, and distributor orders can ship in several sales.
SALE to WINE through SALE LINE: a sale includes one or more wines and a wine appears in many sales, so a many-to-many link is resolved by SALE LINE, which carries quantity and price at the time of sale.
SALE to CASH RECEIPT through CASH APPLICATION, 0..* at both ends: the distributor account says one check often pays several invoices, and the club narrative allows a charge to cover one shipment only.
Both ends of the sale-to-receipt link are optional because a sale with no receipt is an open receivable and a receipt with no sale is an unapplied deposit, and both are real states the winery's books must be able to hold.
RETURN to SALE, 0..* to 1..1: a return references exactly one original sale. This is an assumption the narrative does not confirm.
CUSTOMER typing: one CUSTOMER table with a type column, rather than three subtypes, because guests, members and distributors share the same keys and most attributes, and a member who later buys as a guest stays one customer.
The REA pattern places resources, events and agents in fixed positions so a reader who knows it can find each box by its role (McCarthy, 1982). The entity relationship approach itself treats entities and the relationships among them as the basic units of a data model (Chen, 1976). Primary and foreign keys follow standard relational design (Hoffer et al., 2019).
Questions the Narrative Left Open
1. Does a return always reference exactly one original sale?
2. Can a club member hold more than one card on file?
3. Are tasting room pickups recorded as sales with no carrier, or as a separate event?
4. Can one cash receipt be split across two cash accounts?
References
Chen, P. P. (1976). The entity-relationship model: Toward a unified view of data. ACM Transactions on Database Systems, 1(1), 9-36. https://doi.org/10.1145/320434.320440
Hoffer, J. A., Ramesh, V., & Topi, H. (2019). Modern database management (13th ed.). Pearson.
McCarthy, W. E. (1982). The REA accounting model: A generalized framework for accounting systems in a shared data environment. The Accounting Review, 57(3), 554-578.
Reading the AC 442 Unit 3 instructions
The third AC442 unit asks you to turn a process description into an entity relationship diagram. Identify the entities the narrative names and arrange them by role if your section uses REA: resources, events and agents. Give each entity its attributes, underline the primary key and mark foreign keys. Draw each relationship with multiplicities at both ends, and resolve every many-to-many relationship with an associative entity that carries its own attributes, such as quantity or amount applied. In notes, justify each multiplicity with the sentence of the narrative that supports it, and flag any line that rests on an assumption instead. Explain modeling choices, such as one customer table with a type column versus subtypes. Close with questions the narrative left open. Cite the entity relationship and REA sources and a database text in APA 7.
Inside the AC442 Unit 3 example
The sample lists eleven boxes in three groups, each with attributes and keys: WINE and CASH ACCOUNT as resources; SALES ORDER, SALE, CASH RECEIPT and RETURN as events; CUSTOMER, EMPLOYEE and CARRIER as agents; and SALE LINE and CASH APPLICATION as associative entities. Notes justify the order-to-sale, sale-to-wine and sale-to-receipt multiplicities from narrative sentences. The highlighted sentence explains that both ends of the sale-to-receipt link are optional because open receivables and unapplied deposits are real states. The return link is flagged as an assumption. A note defends one CUSTOMER table with a type column. Citations to McCarthy, Chen and Hoffer and colleagues follow, and four open questions close the notes, starting with whether a return always references one sale.
Where the points sit in the AC442 Unit 3 rubric
AC442 diagrams are graded on correct entities, keys and multiplicities, and on how well the notes justify them. Every many-to-many relationship must be resolved with an associative entity carrying meaningful attributes. Multiplicities should be shown at both ends and match the narrative; graders check that optional and mandatory ends are distinguished. Keys must be marked consistently. The duality relationship between sales and receipts carries the most accounting meaning, so its treatment is examined closely. Notes that tie each line to a sentence, and flag assumptions honestly, earn more than a diagram presented without reasoning. Modeling choices such as subtypes should be argued. Open questions show the model is ready for review. A legible notation and APA 7 citations to the modeling sources count toward the Purdue Global grade.
AC442 Unit 3 help from the desk
Unit 3 diagrams often leave many-to-many lines unresolved, which no relational table can store. Multiplicities appear at one end only, or every end is mandatory, which cannot hold open receivables. Foreign keys are missing from child tables. Customer types are split into three boxes that share every attribute. Notes repeat the diagram instead of justifying it. Assumptions are drawn as fact. If your narrative covers purchasing, payroll or inventory instead of revenue, our writers can draw the diagram with keys and multiplicities and write the notes behind each line.
Get an AC442 Unit 3 example written to your instructions
Paste the process description supplied with Unit 3 and say which notation your section expects, whether crow's foot, Chen or UML, along with the rubric. The diagram and its notes are drawn from that text, every multiplicity cited to a sentence, within 24-48h. Your first custom sample carries no charge. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
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AC442 Unit 3 questions, answered
Why use REA instead of a plain ERD?
REA is still an ERD; it simply organizes boxes into resources, events and agents so accounting meaning is visible in the layout. Some AC442 sections introduce it because every event must link to what it moves and who took part, which catches missing relationships early. If a plain diagram is required, the same boxes and lines appear without the three-column arrangement.
How does the sample decide on a multiplicity?
From a sentence in the narrative. Where the description says a distributor may pay several invoices with one check, the receipt end allows many sales; where it says each shipment goes to one address, the other end is fixed at one. Where no sentence exists, the note says so and records the assumption openly, which is what graders generally want to see.
Can the diagram be drawn in any tool?
Usually, though some sections name one. The sample was drawn in a general diagramming application and exported as an image, with the notes in a separate document, a format instructors commonly accept. What earns marks is the reasoning in the notes and the correctness of each multiplicity, so a neatly scanned hand drawing is sometimes acceptable as well.
Where can I find a free AC442 Unit 3 sample paper?
This page holds a complete AC442 Unit 3 REA entity relationship diagram of a composite winery's revenue cycle, with eleven entities, keys, multiplicities, relationship notes, open questions and APA 7 references.
Why does AC442 Unit 3 need a CASH APPLICATION entity?
A single distributor check often covers several invoices, and 61 invoices were settled with two checks each. That many-to-many link needs its own table, which records the amount of each receipt applied to each sale.