---
kind: "stage-reading-key"
stage: "C2"
title: "Model: the loop"
purpose: "Build and challenge a model of how organizing unfolds."
status: "finished"
closed_legs: 7
publication: "c070d990be88"
status_note: "This describes source publication c070d990be88, not live state."
authority: "This is a reading key. The linked contract and card hold the rules."
---

# C2: Model: the loop

Build and challenge a model of how organizing unfolds.

This is a reading key. The linked contract and card hold the rules.

## 1. Reading order

1. [Contract](../reading/contract.md), [method](../reading/method.md), [standing instructions](../reading/standing.md).
2. Your recorded platform: [Claude](../reading/platform-claude.md) or [Codex](../reading/platform-codex.md).
3. [Full C2 card](../reading/stage-C2.md), then the run's head, diary and handler deliveries as that card prescribes.

## 2. Inputs and permitted reading

Use the full card's startup packet and reading boundaries. Do not use files from later stages merely because this repository contains them. Historical interviews use the files in their selected bundle.

## 3. Outputs, quoted from the card

- `model/elements.jsonl`, `model/arrows.jsonl`, `model/loops.jsonl` (empty if no grounded loop), `model/history.jsonl`
- `fourth/fourth.jsonl` recut in place
- `dimensions.jsonl`
- `structure.md`
- `concept.md`
- `model.md`
- `within_case.md`
- `model/story-pN.md` and `story_rooms-pN.jsonl` per pass
- `saturation.jsonl`
- `findings.jsonl`, opened here if not before
- `tier_history.jsonl` lines for
every recut and every item it moved
- when the third-order tier is recut, `scheme_v2.jsonl` and
`assignments_final.jsonl` rewritten (below)
- `_questions/<slug>.md`
- `RETURN-C2.md` and one packet
- `review-C2.md` answered in `notes-C2.md`
- a `run_manifest.json` entry for the reader
- `notes-C2.md`
- `handback-C2.md`.

## 4. Legs

| Leg | Role | Repeats | Interview point |
|---|---|---|---|
| `C2a` | pass | yes | - |
| `C2b` | reviewer build | no | - |
| `C2c` | reviewer check | no | mid |
| `C2d` | closing pass | yes | - |

## 5. Checks and handback

The stage card governs its checks. The [handler](../reading/handler.md) and [leg controller](../reading/legs.md) govern opening, close, pause and recovery. Do not infer permission to start from this page. Keep notes and the head current; the conversation and filesystem must match at any resumable close.

## 6. Published record

Status: **finished**, 7 recorded closed legs. This describes source publication `c070d990be88`, not live state.


[Checkpoint interviews](../interviews.html?stage=C2) · [Source hashes](../sources/manifest.json)