> ## Documentation Index > Fetch the complete documentation index at: https://b2-b-playbook.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Four-fits card Market–product; Product–channel; Channel–model B2B Playbook working file. Read [four fits](../playbooks/01-strategy-and-buyers/four-fits.md) first. One company. Four sentences. Delete teaching notes. Do not paste a \$100M case study as the live card. Copyright © 2026 Ivan Xu. Private operating copy permitted. See LICENSE. *** ## Market–product * Segment and job: * Dated evidence they want it (love / pay / pull): * What would prove this sentence wrong: ## Product–channel * Path this product is actually built for: * Path we wish we had (do not plan from this): * What we would have to change in the product to use a different path: ## Channel–model * Year-one pay (ARPU / ACV): * Fully loaded cost of one success on the real path: * Danger: hunter motion on a self-serve price, or free loop on a field close (yes / no / how): ## Model–market * How this market already buys: * Believable capture × number of buyers × price — does the company we claim still exist? * Board story we will not tell until this math is honest: ## Change control * What we want to add (channel, SKU, AI, segment): * Which of the four sentences it would break: * Date these four were last re-written: