Foundation Sprint Magic Lenses: Brainshelf Book Catalog (Day 2 Afternoon)
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
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
| 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
| 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
| 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
| 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
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)
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
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
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
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