Foundation Sprint Magic Lenses: Brainshelf Book Catalog (Day 2 Afternoon)
Scenario
Section titled “Scenario”The Brainshelf team is in Day 2 afternoon. Approach Options is signed; 5 candidates advance. Jamie invokes tool-foundation-sprint-magic-lenses to evaluate each through 4 classic plus 1 custom lens and name a top bet + backup.
Approach labels: A=Yellow Camera, B=Blue Library, C=Green Voice, D=Red Bookstore, E=Purple Triage.
Customer Lens
Section titled “Customer Lens”Question: Which approach do target customers immediately understand and want?
| Approach | Customer perception | Position |
|---|---|---|
| Yellow Camera | ”I get it. Point and capture.” | HV-HF |
| Blue Library | ”Pretty. But I don’t have books to put in it yet.” | MV-HF (chicken-and-egg) |
| Green Voice | ”Cool, but I talk to my phone in public?” | MV-LF |
| Red Bookstore | ”Wait, you do that?” (delight) | VHV-LF |
| Purple Triage | ”Like Pocket for books. Sure.” | MV-HF |
Top per Customer Lens: Yellow (broad), Red (deep delight).
Pragmatic Lens
Section titled “Pragmatic Lens”| Approach | Build cost | Risk |
|---|---|---|
| Yellow Camera | Medium (OCR + cover-recognition; Apple Vision API available) | Acceptable |
| Blue Library | Low (CRUD + UI polish) | Low |
| Green Voice | High (voice quality + book entity resolution) | High |
| Red Bookstore | High (geofence + offline book DB) | Very high |
| Purple Triage | Low-medium (share extension + queue UI) | Low |
Top per Pragmatic Lens: Blue, Yellow.
Growth Lens
Section titled “Growth Lens”| Approach | Why people would tell a friend |
|---|---|
| Yellow Camera | ”I just snap books.” Decent. |
| Blue Library | ”My library looks nice.” Low signal. |
| Green Voice | High novelty IF voice quality holds. |
| Red Bookstore | ”It tells me at the bookstore if I’ve already read it.” Highest novelty. |
| Purple Triage | ”Pocket for books.” Low novelty. |
Top per Growth Lens: Red, Green, Yellow.
Money Lens
Section titled “Money Lens”| Approach | Monetization story |
|---|---|
| Yellow Camera | Free tier with limit; paid sync + cross-device. Familiar. |
| Blue Library | Same as Yellow; aesthetic premium possible. |
| Green Voice | Same as Yellow; voice is free differentiator. |
| Red Bookstore | Bookstore mode could be a premium feature. |
| Purple Triage | Triage capacity could tier (Pocket precedent). |
Top per Money Lens: Similar across all; slight edge to Blue and Red.
Custom Lens 1: Defensibility Against Goodreads / Amazon
Section titled “Custom Lens 1: Defensibility Against Goodreads / Amazon”| Approach | Defensible? |
|---|---|
| Yellow Camera | No. Goodreads has cover scanning today. |
| Blue Library | Partially. Brainshelf principles (private, no feed) are strategically distinct. |
| Green Voice | Yes. Goodreads unlikely to commit to voice. |
| Red Bookstore | Yes. Amazon-owned Goodreads is awkward for geofencing bookstores. |
| Purple Triage | Partially. The triage pattern is well-known. |
Top per Defensibility Lens: Red, Green.
Pattern Review
Section titled “Pattern Review”Consistent winners: Yellow (positive on 4 of 5 lenses), Red (positive on 4 of 5 lenses).
Consistent losers (eliminated):
- Blue: chicken-and-egg empty library at launch.
- Green: feasibility risk too high for the differentiation it provides.
- Purple: doesn’t carry the “did I read this?” recall pain hard enough.
Contradictions:
- Red is high on Customer + Growth + Money + Defensibility but failing Pragmatic. Hardest to ship; highest leverage if shipped.
- Yellow is positive across all five but never #1 on any single lens. Strong consistent middle.
Biggest trade-off: Boring-and-shippable (Yellow) versus risky-and-distinctive (Red).
Top Bet (Decider Supervote)
Section titled “Top Bet (Decider Supervote)”Top bet: Approach A (Yellow Camera-First Capture).
Rationale: The riskiest assumption for Brainshelf is not “is this concept appealing” (Red would tell us that). The riskiest assumption is “will people switch from doing nothing to using a tracking app at all if friction drops below 3 seconds?” Yellow tests that hypothesis most directly. If Yellow succeeds, Red becomes a Phase 2 differentiator. If Yellow fails, Red doesn’t save the product.
Backup Plan
Section titled “Backup Plan”Backup: Approach D (Red Bookstore Mode).
If the Design Sprint test of Yellow shows weak adoption (“customers nod but don’t actually capture”), Brainshelf pivots to lead with bookstore-mode delight. Recall-at-context becomes the wedge, capture follows. This is a strategically distinct direction (context-driven recall) not an iteration of Yellow.
Decision Rationale
Section titled “Decision Rationale”The team converged on Yellow over Red because the test value of Yellow is higher. Validating the core capture-speed differentiator early de-risks every downstream investment. Red is more delightful but tests a narrower part of the product. Better to know if the foundation works first.
Decider Checkpoint
Section titled “Decider Checkpoint”Decider sign-off required before Founding Hypothesis writing begins.
- Jamie names Yellow (Camera-First Capture) as the top bet.
- Jamie names Red (Bookstore Mode) as the backup, strategically distinct from Yellow.
- Jamie commits to NOT building Yellow as a Camera with Red features grafted on.
- Jamie agrees to test the Yellow top bet via the planned Design Sprint week of May 26.
Signed: Jamie (founder, PM), 2026-05-14 15:40 PT