Eleven boxes in REA order and a duality link optional at both ends make up the revenue-cycle diagram a composite winery gets for AC442 Unit 3. Searches like "ac 442 unit 3 assignment example", "ac442 unit 3 sample" and "ac442 unit 3 example" land here.
What a finished AC442 Unit 3 entity relationship diagram looks like
One horizontal page of diagram in UML class notation, with multiplicities written as 0..* or 1..1 at each end, followed by two pages of notes. Resources run down the left: WINE, identified by a SKU combining varietal, vintage and bottle size, and CASH ACCOUNT. Events fill the center: SALES ORDER, SALE, CASH RECEIPT and RETURN. Agents sit on the right: CUSTOMER, EMPLOYEE and CARRIER, with CUSTOMER carrying a type attribute for walk-in guest, club member or distributor rather than splitting into three boxes. Two associative entities resolve many-to-many links: SALE LINE, joining SALE to WINE with quantity and unit price, and CASH APPLICATION, joining SALE to CASH RECEIPT with the amount applied. Primary keys are underlined and foreign keys carry a trailing FK. The notes read every line in both directions.
How a AC442 Unit 3 example is structured
Placement on the page follows REA, so a reader who knows the pattern finds each box by its role before reading a label. Notes are ordered by relationship, one short paragraph each, and every paragraph cites the narrative sentence that justifies its multiplicity; a line with no sentence behind it is flagged as an assumption rather than drawn as fact. The duality relationship receives the longest note, because it is where accounting meaning enters the model: a sale without a receipt is an open receivable, and a receipt without a sale is an unapplied deposit, so both ends are optional. Customer typing is argued in its own note, weighing one table with a type column against three subtypes. A closing list records four questions the narrative left open, such as whether a return always references exactly one original sale.
Resources left, agents right
Placement mirrors the REA pattern, with events in the middle column linked to the wine or cash they move and to the parties on each side.
Sale lines and cash applications
Two associative entities hold the quantities and amounts the many-to-many links need, each keyed on the identifiers of both parents.
Optional at both ends
Duality is drawn 0..* to 0..*, since open invoices and unapplied checks are both normal states in a set of books rather than errors.
One customer table, typed
Guests, members and distributors share a box with a type attribute, and a note lists which attributes stay empty for which type.
Four open questions
Assumptions the narrative did not settle, each listed beside the multiplicity it would change if the answer came back differently.
Where marks go in AC442 Unit 3
The duality relationship is where graders look first. Drawing SALE to CASH RECEIPT as one-to-one, because most retail sales are paid on the spot, breaks the model for distributors and for club deposits, and the error carries into every later query. Multiplicities that appear without a narrative sentence behind them are marked as guesses. Documents drawn as entities, such as an invoice box beside a sale box holding the same facts, suggest paper forms copied onto the diagram. Missing associative entities are common too: a direct many-to-many line between SALE and WINE has nowhere to store quantity or price, and rubrics usually deduct for it. Keys matter, since a composite SKU needs its parts stated. Notes that describe boxes without reading the lines leave cardinality undefended, which costs explanation credit.
Get a 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.
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.