Lessons 80.3 through 83.5 each produced an artifact — pathway sentence, value exchange, offer card, price hypotheses, scorecards, partner policy. This appendix compresses them into one page that chooses the next experiment: which pathway, which model, which offer, at what price, on what evidence, with what unknowns, owned by whom, by when.

The blank memo

# REVENUE-MEMO.md — [Project], [date]

## Decision (one sentence)
- We will test ___ before ___, because ___.

## Pathway + model
- Primary pathway: product-led / community-led (one only)
- First model: ___ / explicitly deferred: ___

## Offer + price
- Offer (one line): ___ / price + terms: ___
- Delivery cost assumption: ___ / capacity: ___

## Evidence (what we already know)
- Value exchange: ___ / paid-test or interview signal: ___
- Reference alternative + its price: ___

## Unknowns (what this experiment must teach)
- Learning question: ___ / falsification line: "If ___,
  we will ___ instead."

## Owner + date
- Owner: ___ / ship: ___ / review: ___

Every line forces a trade. Decision in one sentence prevents testing three models at once. Pathway plus model recalls Lesson 80.0's fork: product-first serves interaction to adoption; community-first serves product decisions to participation — name the leader and what the other side defers. Offer plus price links Appendices 83.A and 83.B: the card plus the interview evidence behind its number. Evidence lists only what happened — past payments, workaround costs, signed tests — never forecasts. Unknowns carry the falsification line: the result that kills the experiment and names the pivot in advance. Owner plus date makes review inevitable. File one memo for the primary track built deeply and sketch the other track in two lines so Part XV closes dual-track: one experiment owned, the other explicitly deferred with its trigger.

Worked logic: how the line items connect

A filing-brief community used the memo to stop debating and start testing (illustrative hypothetical): pathway community-led; model $12/month membership funding office hours and the archive (Appendix 83.C's math: 50 members × $12 = $600 against ~$300 library plus moderation time); deferred: sponsorships until the partner policy (Appendix 83.E) has an owner. Price evidence came from three interviews (Appendix 83.B pattern: analysts already pay $15–$25 for source tools and named "searchable archive plus weekly review" as the missing piece). Delivery cost assumed six moderation hours plus the library subscription; capacity capped at 80 members per moderator before a second hire. Falsification line: "If 25 founding members do not renew at day 60, we pause dues and test the $1,200 team workshop (Appendix 83.D) instead." Owner named, ship date and 60-day review date set.

Check pricing logic against durable references before shipping: packaging and value-metric thinking in the Paddle pricing strategy guide, fee reality on Gumroad pricing if dues or workshops flow through a simple storefront.

Rules that keep it one page

• One experiment per memo. Two experiments is a portfolio review wearing a memo's clothes — write two memos or choose.
• Evidence means behavior: money paid, hours logged, alternatives priced, tests signed. Interest ("members seem excited") goes in unknowns, not evidence.
• Date every review before you start. A memo without a review date is a wish; with one, it is a control loop feeding Part XVI's operating cadence.
• File the dead memos. A falsified experiment with its learning question answered is the asset — next quarter's memo starts from its unknowns, not from zero.

Verify fast

Cover everything below the Decision line. Can a stranger read the single sentence and predict the model, price, and review date underneath? If not, the decision is hedging — sharpen it until the page is predictable from its first line.