Day 4 (Thursday) move of a Design Sprint that produces the planning artifact for the day. Output covers the prototype role plan (Maker, Stitcher, Writer, Asset Collector, Interviewer), prototype brief (what to build, fidelity bar, time allocation per role), canonical Five-Act Interview script (Welco

<! PM Skills https://github.com/product on purpose/pm skills Apache 2.0 Design Sprint Prototype Plan (Thursday morning) Thursday is the prototype build day. This skill produces the morning planning artifact that makes the build run; it does NOT build the prototype itself. The skill assigns roles, locks the fidelity bar, drafts the Five Act interview script, defines the trial run gate, and confirms Friday participants. The actual building (Figma frames, slideware decks, role play scripts, paper assemblies) is craft work the team owns through the rest of Thursday. Family contract: [ docs/reference/skill families/design sprint skills contract.md ](../../docs/reference/skill families/design sprint skills contract.md). This skill is a member of design sprint skills . When to Use It is Thursday morning of the Design Sprint and Wednesday's storyboard is signed off. The Friday participant tracker needs a Thursday morning confirmation check; cancellations now trigger buffer activation. The interview script needs to be drafted (or refined from a prior sprint's template) before the interviewer can mock run it Thursday afternoon. The team needs role assignments before parallel build work begins; ad hoc assignment Thursday afternoon wastes 1 2 hours. When NOT to Use Wednesday is not closed. Return to tool design sprint decide and storyboard ; without a locked storyboard, the prototype has no spec. The team is trying to use this skill to build the prototype. The prototype is craft work (per Ratified Decision 1 in the DS integration plan). This skill plans Thursday; the build happens in Figma, Keynote, paper, or whatever the medium is. The team has decided to skip Friday's trial run. Trial run is the gate that catches "prototype is unreachable" or "interview script confuses customer" before live interviews start. Skipping it converts Friday into a debugging session. Friday participant cancellations have triggered cohort shrinks to fewer than 4. Pause the sprint and decide whether to postpone Friday or accept a reduced evidence test. What This Skill Produces A single bundled artifact with five sections: 1. Prototype role plan : assigns 5 canonical roles (Maker, Stitcher, Writer, Asset Collector, Interviewer) across the team. Roles can double up on small teams; cannot triple up except for Asset Collector. 2. Prototype brief : one page spec covering what to build (storyboard panels in scope), fidelity bar (what "real enough" means for the medium), time allocation per role, and what's explicitly NOT being built. 3. Interview script (Five Act) : canonical Five Act structure (Welcome, Context, Intro, Tasks, Debrief) with team supplied task wording derived from the storyboard. The act sequence is fixed; only Tasks is heavily customized. 4. Trial run checklist : the gates the prototype must pass Thursday afternoon (canonically 16:00 17:00) before Friday begins. Each gate is a yes/no item the interviewer or Maker confirms. 5. Participant confirmation tracker : Thursday morning re confirmation of all 5 Friday slots; cancellations trigger buffer slot activation; failures cascade to a cohort decision moment. See references/TEMPLATE.md for the canonical structure and references/EXAMPLE.md for the Brainshelf book catalog Thursday morning artifact. Five Canonical Roles Sprint book Chapter 16 defines these 5 roles. The skill assigns them; the humans fill them. Role What they do Typical owner Maker Builds the prototype surface (Figma frames, Keynote slides, role play props). Owns visual and interaction work. Design lead Stitcher Connects the Maker's surfaces into a coherent end to end flow (Figma interactions, Keynote transitions, role play sequence). Design lead OR engineering lead Writer Writes prototype copy (button labels, body text, error states, microcopy). Critical for credibility; bad copy breaks trust. PM OR researcher Asset Collector Sources images, icons, sample data (book covers, names, dates, fake but believable data). Anyone with free hands; often whoever isn't on the critical path. Interviewer Runs Friday's interviews. Spends Thursday afternoon drafting and mock running the Five Act script. Researcher OR PM with interview experience. On a 4 person team, Maker and Stitcher typically merge (one design owner); Writer and Asset Collector can merge; Interviewer is always a dedicated role. Five Act Interview Structure Canonical structure from Sprint book Chapter 17. The act sequence is fixed; the Tasks act is heavily customized; the other acts are mostly canonical wording. Act Time Purpose Canonicality Welcome 5 min Friendly intro; consent confirmation; explain not testing the customer Canonical wording with team name swap Context 5 10 min Learn the customer's current behavior and context related to the challenge Canonical questions; team adapts to challenge Intro 5 min Introduce the prototype; explain it's a prototype (some things won't work) and ask the customer to think aloud Canonical wording Tasks 20 30 min Customer attempts the storyboard tasks; interviewer observes and probes; team observes silently from breakout room Team supplied wording derived from storyboard Debrief 5 10 min Open ended reactions; pricing questions if relevant; thank you Canonical structure; team adapts pricing question Common Pitfalls Treating the prototype as a deliverable instead of a learning tool. The prototype dies Friday at 17:00 PT regardless of how Friday goes. Investing engineering time in polishing it past the fidelity bar wastes Thursday. Polishing instead of building enough realism. Fidelity bar question: "Will a customer believe this is real for the 30 minute interview?" If yes, the prototype is done. Polishing past that point steals time from trial run and recovery. Interview script with leading questions. "Did you find the camera flow easy?" leads; "Walk me through what you just did" doesn't. Writer (or Interviewer) reviews script for leading questions before trial run. Skipping trial run. Trial run catches dead Figma links, missing assets, confusing copy, and interviewer script too long failures. Always run with a fake customer (a teammate playing a target profile customer) Thursday afternoon. Asset Collector role left unassigned because "it's not important." Asset Collector is the role that prevents "lorem ipsum on the demo screen" and "stock photo of a person who clearly isn't the target customer." Always assign. Five Act Tasks act over scripted. Tasks should be open ended ("Try to capture this book and find it later in your library"); over scripted tasks become a tutorial, not a test. Cancellations Thursday morning not surfaced because "we'll figure it out." Thursday morning is the last clean window to activate buffer participants. By Thursday afternoon, recruiter has lower confidence in confirmation. Cross Skill Usage Prerequisites: tool design sprint decide and storyboard . Prototype plan consumes Wednesday's storyboard as the build spec. Without a storyboard, this skill has no panels to map roles against. This skill does NOT invoke tool note and vote . Thursday morning planning has no voting moment; the role plan and script decisions are Facilitator led with Decider sign off. Next invocation in the sprint: tool design sprint test and score Friday morning. Canonical Sources Knapp, J., Zeratsky, J., and Kowitz, B. Sprint . Simon and Schuster, 2016. Thursday chapter (Chapters 14 16) and Five Act Interview (Chapter 17). GV Design Sprint Guide. "Sprint Week Thursday." https://www.gv.com/sprint/ Character Capital. "Design Sprint Day 4." https://www.character.vc Google Design Sprint Kit. "Thursday agenda template + Five Act Interview script template." https://designsprintkit.withgoogle.com/ Decider Checkpoint This skill ends with a Decider Checkpoint in references/TEMPLATE.md . The Decider approves the role plan, the fidelity bar in the prototype brief, the interview script's Tasks act, and the trial run gate criteria. Once signed, the team disperses into parallel build work; the Decider returns Friday PM for the post interview Decider review.

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