# C02 Resources — Data Collection & Analytical Diagrams **Criterion scope:** Data collection methods (interviews, observations, surveys, reports), user stories, analytical diagrams (context diagrams, data flow diagrams, use case diagrams), UML. --- ## C2-0: General Foundations ### External Resources | Resource | Source | Format | VCAA Mapping | Why It's Useful | |----------|--------|--------|--------------|-----------------| | [AI Disclosure Log — worked C02 example](https://git.jeremychen.au) | The Hamilton and Alexandra College (AU) | Markdown template | AI disclosure — C02 authenticity requirement | Your `C020-AI-Disclosure-Log.md` task file contains a complete worked example entry for a context-diagram AI interaction. Use the four-field format (what you asked / what it produced / what you kept / what you changed) for every C02 AI interaction. Start logging in Week 1 — retrospective logs collapse under presentation questioning. | --- ## C2-1: Data Collection ### Existing Materials (CriterionXX/) Criterion02/ has user stories activities (including teacher toolbox), data collection guidance, and links to SRS and diagrams. Solid foundation. ### External Resources | Resource | Source | Format | VCAA Mapping | Why It's Useful | |----------|--------|--------|--------------|-----------------| | [VCAA Assessment — Applied Computing](https://www.vcaa.vic.edu.au/curriculum/vce-curriculum/vce-study-designs/applied-computing/assessment) | VCAA (AU) | Reading | Data collection — official requirements | The authority on what VCAA expects from data collection evidence. | | [Qualitative Data vs Quantitative Data — Five Guys Example](https://www.youtube.com/watch?v=jC7rfXRpNp0) | YouTube (US) | Video | C2-1: labelling data as qualitative or quantitative | Uses a fast-food ordering scenario to show the exact distinction; concrete enough to apply directly to your own interview notes and survey results. Useful before completing `prepared-data.md`. | ### Gaps — C2-1 - **Minimal.** Data collection methods (interviews, surveys, observations, reports) are well-understood concepts. The existing materials and the VCAA guidance are sufficient. - A short video showing a student conducting a data collection interview for their SAT would be useful as a model but is not critical. --- ## C2-2: Analytical Diagrams ### Existing Materials (CriterionXX/) Criterion02/ has dedicated lessons for context diagrams, data flow diagrams, and use case diagrams, plus two quizzes. Good coverage. ### External Resources | Resource | Source | Format | VCAA Mapping | Why It's Useful | |----------|--------|--------|--------------|-----------------| | [Ryan's Tutorials — Data Flow Diagrams](https://ryanstutorials.net/software-design-and-development/data-flow-diagrams.php) | Ryan's Tutorials (AU) | Reading + visual diagrams | Context diagrams, data flow diagrams, processes, entities, data stores, data flows | Excellent free tutorial. Uses accessible language suitable for high school students. Covers DFD components, multi-level design, balancing, and 14 rules for valid DFD construction. Includes the 8-step creation methodology. | | [NSW Software Engineering: Context and Dataflow Diagrams](https://www.youtube.com/watch?v=XeJs9sYAuMg) | YouTube (AU) | Video | C2-2: context diagram features; Level-1 DFD features; what goes on each diagram | AU secondary curriculum video that draws both diagrams side by side for the same system — directly addresses the common mistake of adding processes to the context diagram. Closest external resource to VCE notation. | | [Extend and Include in the UML Use Case Diagram](https://www.youtube.com/watch?v=t7U0zz74xQg) | YouTube (UK) | Video | C2-2: «include» vs «extend» relationships; arrow direction | Focused explainer on the two most-confused UML relationships, including arrow direction. Watch before finalising your use case diagram and before the hand-drawn assessment. | | [Lucidchart — UML Use Case Diagram Tutorial](https://www.lucidchart.com/pages/uml-use-case-diagram) | Lucidchart | Reading + interactive tool | Use case diagrams: actors, use cases, associations, system boundary, include, extend | Well-structured tutorial with visual examples. Lucidchart can also be used as a free tool for students to draw their diagrams. | | [Lucidchart — How to Make a Data Flow Diagram](https://www.lucidchart.com/pages/data-flow-diagram/how-to-make-a-dfd) | Lucidchart | Reading + interactive tool | Context diagrams, data flow diagrams — creation process | Step-by-step guide to creating DFDs, starting from context diagrams. Students can use Lucidchart's free tier to create their actual SAT diagrams. | | [Lucidchart — Data Flow Diagram Examples](https://www.lucidchart.com/blog/data-flow-diagram-tutorial) | Lucidchart | Reading + visual examples | DFD components, symbols, levels | Examples of DFDs at different levels with explanations of each symbol type. Good reference for students while creating their own. | | [GeeksforGeeks — Use Case Diagram](https://www.geeksforgeeks.org/system-design/use-case-diagram/) | GeeksforGeeks | Reading + diagrams | Use case diagrams: actors, use cases, system boundary, relationships | Comprehensive reference with examples. Good for students who prefer text-based learning. | | [Creately — Use Case Diagram Tutorial](https://creately.com/guides/use-case-diagram-tutorial/) | Creately | Reading + interactive tool | Use case diagrams — creation and relationships | Tutorial with an embedded diagram editor. Students can practice creating use case diagrams directly. | | [Visual Paradigm — Use Case Diagram Tutorial](https://online.visual-paradigm.com/diagrams/tutorials/use-case-diagram-tutorial/) | Visual Paradigm | Reading + visual | Use case diagrams — comprehensive guide | Detailed beginner's guide covering all UML use case diagram elements. | ### Wiki pages for C2-2 | Page | What it covers | |---|---| | [Context Diagram vs Data Flow Diagram](/sd/C02/Context%20Diagram%20vs%20Data%20Flow%20Diagram) | Side-by-side table of what can appear on each diagram; the most common notation mistakes (DRAFT) | | [What Is an Entity?](/sd/C02/What%20Is%20an%20Entity) | Human and non-human entities; how to find all entities from user stories; common omissions (DRAFT) | | [Excalidraw Diagram Starters](/sd/C02/Excalidraw%20Diagram%20Starters) | Pre-framed skeletons for all three C02 diagrams with shape keys, notation rules, and a pre-validation checklist. Open the `.excalidraw` file from your teacher or use excalidraw.com (free, no account). (DRAFT) | ### Gaps — C2-2 - **No VCE-specific video** walking through all three diagrams for a single project. The NSW video above is the closest AU-curriculum substitute. A teacher-recorded walkthrough would close this gap fully. - **Hand-drawing practice** — no external resource covers the specific 45-minute timed rehearsal format used in the C2-2 validation. This is a candidate for a teacher-recorded video. - **Excalidraw starter template** — a text-based wiki scaffold is now available at [Excalidraw Diagram Starters](/sd/C02/Excalidraw%20Diagram%20Starters). A companion `.excalidraw` binary file (with actual shapes) is still a candidate for a teacher-built asset. --- ## Recommended Actions 1. **NSW Software Engineering video** (YouTube) covers context diagrams and DFDs side by side — closest AU-curriculum substitute for a VCE-specific explainer. Use alongside the [Context Diagram vs Data Flow Diagram](/sd/C02/Context%20Diagram%20vs%20Data%20Flow%20Diagram) wiki page. 2. **Lucidchart** (free tier) is recommended as the tool for creating digital diagrams — it has templates for all three diagram types. 3. **Teacher video needed** — a 6-min hand-drawing demo under timed conditions (all three diagrams) is flagged in `C022-Practice-Hand-Drawing.md` as the key gap between digital practice and test performance. No suitable external substitute found.