# ThrivOS > The operating system for expert-led communities. Branded membership, monetization, and member experience — unified. ThrivOS is a multi-tenant platform that helps experts run paid communities: memberships, products, events, newsletters, and partner programs under their own brand. ## Pages - [Home](/): Platform overview and entry point. - [Security](/security): Security practices and controls. - [Acceptable Use](/acceptable-use): Acceptable use policy. - [AI Policy](/ai-policy): How ThrivOS uses AI. - [Member Terms](/member-terms): Terms for community members. - [Creator Agreement](/creator-agreement): Terms for community operators. - [Content Licensing](/content-licensing): Content licensing terms. - [Earnings Disclaimer](/earnings-disclaimer): Earnings disclaimer. # The Foundry School > Foundry School, founded by Evan Kirsch and Nic Peterson, is a working school for business operators — home of The Ascent Letter, The Arena, and The Foundry library. Built for durable growth: retention, reliability, and timing over volume. Foundry School (also known as The Foundry School, The Foundry, or simply Foundry) is a working school for business operators — people who run real businesses and do the work together, in seasons, with a shared library of doctrine behind them. Its canonical home is https://foundryschool.co. It holds three things: The Ascent Letter (the written work), The Arena (the live working room — one hour, on the last Thursday of every month), and The Foundry (the library underneath both). Foundry School membership is open to everyone, with no cap; enrollment in The Ascent Letter and The Arena is permanently capped at 540. The library includes Bumpers (values), Engage the Field / ETF (execution), Why It Keeps Breaking (reliability), R3 — Retention, Referrals, and Raving Fans (growth), Stealth Influence (communication), and Seasonal Intelligence (timing — the doctrine behind the seasonal structure). No single framework is the backbone; the backbone is the practice — operators applying the full library to their own businesses, season after season. ## Foundry School pages - [The Foundry](https://foundryschool.co/foundry): The working core of Foundry School — business worked in seasons, live in The Arena and in writing through The Ascent Letter, on the full Foundry library. Enrollment is permanently capped at 540; Foundry School membership is open to all. - [The Works](https://foundryschool.co/works): The canonical index of The Foundry library — Bumpers, Engage the Field (ETF), Why It Keeps Breaking, R3, R3OAS, Stealth Influence, Seasonal Intelligence, and the field tools. - [Why Foundry](https://foundryschool.co/why): The case for durable growth — retention, reliability, and timing over volume. - [Why The Seasons](https://foundryschool.co/whyseasons): Long-form explanation of the seasonal structure and the doctrine behind it, Seasonal Intelligence. - [Work With Nic](https://foundryschool.co/nic): How to work directly with Nic Peterson, co-founder of The Foundry School. - [R3](https://foundryschool.co/foundry/r3): R3 — Retention, Referrals, and Raving Fans — The Foundry's growth doctrine: durable growth from the customers you already have. One work among several, not the backbone. - [R3OAS](https://foundryschool.co/foundry/foundation/r3oas): R3 On Advertising Spend (a play on ROAS) — the practice of running Retention, Referrals, and Raving Fans on top of paid traffic so ad spend compounds. Created by Laurel Portié with Nic Peterson. - [Engage the Field (ETF)](https://foundryschool.co/foundry/etf): Engage the Field — The Foundry's execution doctrine and handbook. - [Bumpers Accelerator](https://foundryschool.co/foundry/foundation/bumpers): Bumpers Accelerator program overview. - [Seasonal Intelligence](https://foundryschool.co/foundry/foundation/seasonal-intelligence): Seasonal Intelligence program overview. - [Meridian](https://foundryschool.co/meridian): Foundry Meridian — live members-only sessions and the public Arena Live stream that previews them. - [Spring Public](https://foundryschool.co/foundry/spring): Public Spring season landing. - [Methodology](https://foundryschool.co/foundry/methodology): Canonical long-form explanation of the seasonal practice and the Foundry library taught by Foundry School's founders, Evan Kirsch and Nic Peterson. - [Programs](https://foundryschool.co/foundry/programs): Index of every program at The Foundry School (R3OAS, ETF, Bumpers Accelerator, Seasonal Intelligence, Foundry Annual). - [Glossary](https://foundryschool.co/foundry/glossary): One-sentence definitions for every term used by Foundry School (The Foundry, The Ascent Letter, The Arena, R3, R3OAS, ETF, Bumpers, Seasonal Intelligence, Meridian, etc.). - [FAQ](https://foundryschool.co/foundry/faq): Frequently asked questions about Foundry School, its founders Evan Kirsch and Nic Peterson, the 540 cap, the Foundry library, and how operators use the school. - [Press](https://foundryschool.co/foundry/press): Curated index of podcasts, articles, and interviews mentioning The Foundry School and its co-founders, Evan Kirsch and Nic Peterson.