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e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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> **DRAFT** — under teacher review.
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# Activity — Design a Hot Cross Bun Matrix
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The Hamilton and Alexandra College · Year 12 · 2026
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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The fastest way to learn how to *design* an evaluation matrix — and then decide **which elements of the winning design need to be developed further** — is to build one for something real and edible. CHOICE rates hot cross buns with the same discipline it rates headphones; in this activity, so will you. By the end you'll have designed, run, defended a matrix *and* produced a "further develop" list — the exact deliverable for **C4-2** and **Unit 4 Outcome 1**.
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[CHOICE's actual hot cross buns review-and-compare](https://www.choice.com.au/food-and-drink/bread-cereal-and-grains/bread/review-and-compare/hot-cross-buns) is the reference matrix you're learning from.
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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{{Video|src=https://www.youtube.com/watch?v=k7m04xW0fzk}}
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**🎯 Watch first:** notice the panel scores against *agreed criteria*. Your job today is to decide those criteria — and defend them.
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---
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## The challenge
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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We have **two or three brands** of hot cross buns. Working as a review panel, you will:
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1. Design an evaluation matrix.
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2. Use it to crown a winner.
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3. **Decide which elements of the winning bun design need to be developed further** — including elements your matrix did *not* score.
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That third step is the headline skill for [C4-2](/sd/C04/C4-2%20Checkpoint%20-%20Evaluation%20Matrix). It's the harder one — and the one most students skip.
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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---
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## Step 1 — Make the design decisions *before you taste*
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Criteria come **first**, never invented afterwards to crown the bun you happened to like. Working from the [seven design decisions](/sd/C04/Designing%20an%20Evaluation%20Matrix), agree on:
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- **Who you're recommending for** — the persona drives everything. "Best bun" is meaningless; "best bun *for a family's Easter breakfast*" tells you what to measure.
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- **Your criteria** — the handful that decide it for that person.
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- **How each is measured** — a blind panel rating, or something objective like price-per-bun or counting fruit pieces.
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- **Weights, justified** — where your point of view lives.
9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- **A scale** (use 0–5).
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- **What you deliberately exclude, and why** — *flag these now; they come back in Step 4.*
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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A worked design for the persona *"a family buying for Easter breakfast"*:
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| Criterion | Weight | How you'll measure it |
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|---|---|---|
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| Taste | 35% | Blind panel rating, 0–5 |
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| Texture & freshness | 20% | Blind panel rating |
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| Fruit & spice | 20% | Blind panel rating |
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| Value | 15% | Price per bun → converted to a 0–5 score |
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| Appearance | 10% | Rating |
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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*Deliberately excluded:* packaging — it doesn't change how the bun eats, so it can't help one brand beat another on the matrix. (Hold on to this — Step 4 picks it back up.)
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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---
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## Step 2 — Taste blind, score independently
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Two habits that are real evaluation skills, not just fairness:
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- **Blind it.** Label the brands A, B, C with the names hidden. If you can see the brand, the brand scores it for you.
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- **Score alone first, then compare.** If everyone just agrees with whoever speaks loudest, you've measured confidence, not buns.
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Apply your weights to each brand's scores to get a **weighted total**.
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---
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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## Step 3 — Crown the winner
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- **Explain** which bun proceeds, citing at least two criteria and their scores.
9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- **Justify** by **naming the rival**: what does your winner give up compared with the runner-up, and why is that trade-off worth it for your persona?
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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---
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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## Step 4 — Decide what to develop further
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You now know *which* bun wins. The harder question — **the C4-2 deliverable** — is: *which elements of that winning design need detailed design work next?*
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The matrix on its own doesn't answer that. Look in **two** places:
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**(a) Where your winner scored weakest.** If your winner beats the rivals overall but only got a 3 on *texture*, that is a development priority. The detailed-design task isn't "is the texture good enough?" — it's "*how* will we improve texture in the next version?"
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**(b) Requirements the matrix didn't score.** This is the bit students miss. The matrix scores criteria *the persona uses to choose between options* — taste, value, freshness. But your project has requirements that don't decide *one bun over another*, and so don't earn a matrix row, yet absolutely affect the final product. **Packaging** is the classic case:
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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> The requirement *"attract more customers to consider buying it"* is real — but packaging doesn't change how the bun eats, so it stays out of the matrix. It still has to be designed properly. It belongs on your "develop further" list anyway.
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A quick test for any candidate element:
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> *"If two designs tied on this, would it show up in the matrix?"* If **no**, but it still has to be **designed properly**, it goes on your develop-further list.
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**Now produce three things to develop further** — at least one from **(a)**, at least one from **(b)**.
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> [!NOTE]
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> In C4-2 this is the headline output. The matrix names the winning *idea*; the deliverable is which **elements** of that idea become detailed designs. Packaging-not-in-matrix is your worked example of source (b).
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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---
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## Your scoring sheet
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| Criterion (weight) | Method | Brand A | Brand B | Brand C |
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|---|---|---|---|---|
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| | | | | |
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| | | | | |
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| **Weighted total / 5** | | | | |
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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**To develop further:**
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1. *(from (a) — a matrix-scored criterion the winner is weakest on)*
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2. *(from (b) — a requirement the matrix didn't score, e.g. packaging)*
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3. *(your call — either source)*
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e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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---
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## Why this matters
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9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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The buns are a stand-in. The design decisions are **identical** when you evaluate your own software design ideas in [C4-2](/sd/C04/C4-2%20Checkpoint%20-%20Evaluation%20Matrix). The matrix tells you which idea proceeds; the develop-further list tells you what your detailed design has to *do*. Both come out of this one activity.
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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## See also
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- [Designing an Evaluation Matrix](/sd/C04/Designing%20an%20Evaluation%20Matrix) — the seven design decisions in full
9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- [CHOICE Headphones — Spotting Efficiency and Effectiveness](/sd/C04/CHOICE%20Headphones%20-%20Spotting%20Efficiency%20and%20Effectiveness) — the same matrix discipline applied to a software-flavour example
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- [C4-2 Checkpoint — Your Evaluation Matrix](/sd/C04/C4-2%20Checkpoint%20-%20Evaluation%20Matrix) · [Efficiency vs Effectiveness](/sd/C04/Efficiency%20vs%20Effectiveness)
9e5892 lisa 2026-06-02 06:54:36
SD C04 Hot Cross Bun activity: refocus on the 'which elements to develop further' C4-2 deliverable Drop the stress-test step (tangential to the new focus) and replace with a new Step 4 — Decide what to develop further. Teaches two sources for the develop-further list: (a) where the winner scored weakest in the matrix, and (b) requirements the matrix didn't score (worked example: packaging — out of the matrix because it doesn't change how the bun eats, but still required to 'attract customers to consider buying it'). Add CHOICE hot cross buns review-and-compare source link. Cross-link the new CHOICE Headphones — Spotting Efficiency and Effectiveness page. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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- Reference: [CHOICE hot cross buns review-and-compare](https://www.choice.com.au/food-and-drink/bread-cereal-and-grains/bread/review-and-compare/hot-cross-buns)
e71e64 lisa 2026-05-25 22:51:38
SD C04: add Hot Cross Bun Matrix activity page; link from design guide and C04-home Hands-on Use-Modify-Create activity: design + run + defend an evaluation matrix on 2-3 bun brands, with blind tasting, independent scoring, persona stress-test, a blank scoring template, and transfer to C4-2/U4 O1. Original example (not reproducing CHOICE's data); links the CHOICE bun video. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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