One process on the context diagram opens into five at level 0 in an AC314 Unit 3 data flow diagram of a composite nursery's sales data. Searches like "ac 314 unit 3 assignment example", "ac314 unit 3 sample" and "ac314 unit 3 example" land here.
What a finished AC314 Unit 3 data flow diagram looks like
Three diagrams on three pages. A context diagram shows the nursery's sales system as one process with four external entities: garden centers and landscapers, the home-improvement chain, the lockbox bank and the general ledger system. A level 0 diagram opens that single process into five numbered ones, 1.0 Take orders, 2.0 Pull and deliver, 3.0 Bill customers, 4.0 Apply payments and 5.0 Reconcile chain scans, joined by labeled flows to four data stores: customer master, plant availability, open orders and receivables. A third page explodes process 5.0 alone, since the chain's weekly scan file is the flow most assignments single out. Gane-Sarson notation runs throughout, rounded rectangles for processes and open-ended boxes for stores, with a key naming the convention.
How a AC314 Unit 3 example is structured
The diagrams descend from least detail to most, and each level balances with the one above it: the four entities and every flow crossing the context boundary reappear unchanged at level 0, which a short table beside the diagram confirms flow by flow. Processes are named verb first and numbered, so 5.2 reads as a child of 5.0. Flows are labeled with the data they carry, such as remittance advice or scan file, never with an action. Nothing in the diagrams shows timing, a decision or a physical document, because a data flow diagram records what data moves and where it rests, not when or how. A closing paragraph follows one scan record from the chain's registers into the receivables store, naming the entity it comes from, the stores that hold it and the flow that carries it onward.
Four entities at the boundary
Garden centers and landscapers, the home-improvement chain, the lockbox bank and the general ledger system. The context diagram shows every flow passing between them and the single sales process.
Five processes at level 0
Take orders, pull and deliver, bill customers, apply payments, reconcile chain scans. Each is numbered, named verb first, and fed and drained by flows labeled with nouns.
Four stores, touched only by processes
Customer master, plant availability, open orders, receivables. Each store is read and written through a process, never by an entity or by another store directly.
Process 5.0 exploded
The weekly scan file splits into validation against delivered stock, matching to store and item, and posting to receivables, with rejected lines flowing to an exception store.
A balancing table
Every flow on the context diagram listed beside its level 0 counterpart, proving that nothing crossing the boundary was added or dropped between levels.
Where marks go in AC314 Unit 3
Balancing errors draw the heaviest penalty, a flow present on the context diagram that vanishes at level 0 or an entity appearing only in the detail, because they show the levels were drawn separately. Graders then hunt for the three classic process defects: a black hole that takes data in and sends nothing out, a miracle that produces output from no input, and a gray hole whose outputs could not come from its inputs. Data moving directly between two stores, or from an entity straight into a store, breaks the rule that only processes move data. Flowchart habits cost marks too: decision diamonds, document shapes and arrows labeled with verbs. Mixing Gane-Sarson and DeMarco-Yourdon symbols in one diagram loses a smaller amount, as does an unnumbered process.
Get a AC314 Unit 3 example written to your instructions
Free for a first custom sample and back within 24-48h: a context diagram, level 0 and any exploded process, balanced against each other. A process narrative from the Unit 3 materials, or the flowchart already drawn in Unit 2, is enough to begin, together with the rubric and your instructor's notation.
AC314 Unit 3 questions, answered
How is a data flow diagram different from the Unit 2 flowchart?
A flowchart shows how and in what order work happens, including documents, manual steps and decisions. A data flow diagram shows only what data moves between processes, stores and outside parties. The same nursery appears in both AC314 samples so the contrast is visible: the credit decision drawn as a diamond on the flowchart is simply part of a process in the diagram.
Which notation should the diagram use?
Whichever your textbook or instructor names. Gane-Sarson uses rounded rectangles for processes and open-ended rectangles for stores; DeMarco-Yourdon uses circles and parallel lines. Both express the same rules. The sample uses Gane-Sarson and states it in a key, and it can be redrawn in the other convention if your section expects it, since mixing the two in one diagram is marked down.
How far should the diagram be decomposed?
Usually to level 0, with one process exploded further where the prompt points at it. Decomposing every process to level 2 adds pages without adding marks in most AC314 rubrics. The sample stops each branch where a process could be described in a sentence, which is the common stopping rule, and explodes only the scan reconciliation because it carries the most data.