Day 3 (Wednesday) move of a Design Sprint that runs the art museum layout, heat map, speed critique, straw poll, Decider supervote, rumble-vs-all-in-one decision, and the storyboard that drives Thursday's prototype build. The most decision-heavy day of the sprint. Use Wednesday morning and afternoon after Tuesday's sketches are collected and attribution-stripped. Produces the canonical 5-15 step storyboard that becomes the build spec.
SkillScore86Maintained
Automatic
◆Product Management pack
Last verified 8/18/2026
What it changes
Passed 19 of 22 test cases with the skill, and 14 of 22 without it.
Without skill64%
With skill86%
Checks it passed that the model alone missed
Schedules storyboard building in the afternoon session.
Enforces a strict 3-minute limit per sketch for speed critique.
Each step in the storyboard specifies actions taken by the user.
and 3 more in the full report
5 fixed14 passed either way3 still failing0 broke
Pass-rate lift
+23 pp
Tokens
+72%
Agent turns
0%
Response time
-14%
Model gemini-3.6-flashMeasured 8/18/2026v119 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 5
Prompt
Our Decider is preparing to cast supervotes on 5 concept sketches for a digital media app. They ask if they are restricted to placing a single dot sticker on just one sketch. How many supervote dots does the Decider place, and can they be split?
What was checked, without and with the skill
Checked
Without skill
With skill
States that the Decider receives multiple supervote stickers (typically 3).
Passed
Passed
Explains that supervote dots can be split across multiple sketches to initiate a rumble.
Missed
Passed
case-16 · gemini-3.6-flash · 8/18/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md81 lines3 files
Design Sprint Decide and Storyboard (Wednesday)
Wednesday is the most decision-heavy day of the Design Sprint. The skill runs the art museum layout (sketches posted anonymously on the wall), heat map (silent dot-vote stickers on promising parts), speed critique (3 minutes per sketch summarizing what the team sees), straw poll (each team member's top choice), and the Decider's supervote (the call that triggers the storyboard). Then the team decides whether to rumble (storyboard two sketches as competing prototypes) or all-in-one (storyboard one). The day ends with a 5-15 step storyboard that drives Thursday's build.
Family contract: docs/reference/skill-families/design-sprint-skills-contract.md. This skill is a member of design-sprint-skills.
When to Use
It is Day 3 of the Design Sprint and Tuesday's sketches are collected, attribution-stripped, and uploaded to the shared workspace.
The Decider is present for the full morning (heat map plus critique plus straw poll plus supervote happen 09:00-12:30 canonically).
The team has accepted that the supervote is the Decider's call, not a consensus average.
Thursday's prototype build needs a storyboard by Wednesday end-of-day or the build cannot start clean Thursday morning.
When NOT to Use
Tuesday is not closed. Return to tool-design-sprint-sketch; without independent sketches, the heat-map is meaningless.
Sketcher attribution leaked into Wednesday morning. The Facilitator must re-strip before the heat-map begins; voting on sketchers contaminates the day.
The Decider is absent. Wednesday's supervote cannot be delegated; without the Decider, the day produces a recommendation, not a decision.
The team is treating the supervote as advisory. The supervote is the call. Re-litigating it Thursday morning is sprint failure.
What This Skill Produces
A single bundled artifact with seven sections:
Art museum layout: how sketches are arranged for viewing (typically wall or shared Figma board); attribution stripped; sketches labeled A / B / C / D / etc. in randomized order.
Heat map: silent dot-vote stickers (typically 3 small dots per voter) placed on the most compelling PARTS of any sketch; voters can stack dots on the same element.
Speed critique notes: 3-minute structured walkthrough per sketch by the Facilitator (or rotated team member) summarizing what the team sees; the sketcher does NOT explain their own sketch; concerns are captured as "what would worry me" notes.
Straw poll results: each team member places one larger sticker (typically 1 large dot per voter) on the sketch they would pick if it were their call. Non-binding; informs the Decider.
Supervote: the Decider places their supervote sticker (typically 3 large dots or a distinctively-colored sticker). The supervote is the decision. The Decider can place multiple supervotes on different sketches if running a rumble.
Rumble vs all-in-one decision: the Decider chooses to storyboard one sketch (all-in-one; default) or two sketches as competing prototypes (rumble; chosen when the supervotes split clearly across two distinct approaches).
Storyboard: 5-15 step storyboard derived from the supervoted sketch(es); each panel shows what the customer sees and what they do; specific enough that Thursday's build can begin without re-debating the design.
See references/TEMPLATE.md for the canonical structure and references/EXAMPLE.md for the Brainshelf book-catalog Wednesday artifact.
Wednesday Time Structure
The full Wednesday workshop is approximately 7 hours (09:00-12:30 + 13:30-17:00). The skill's bundled artifact emerges across the day:
Pre-sprint diagnostic that determines whether a team should run a Design Sprint now, postpone it, or do prerequisite work first. Produces a Go / Conditional Go / Wait verdict with diagnosis, recommended preconditions, attendee list, customer recruiting plan, and pre-sprint activities. Use when a team is considering starting a Design Sprint and wants a fast yes/no diagnosis before committing five days of team time and customer recruiting cost.