# C1294 — Define the operation inventory contract

## Question

What makes anoperationusablebetweenfamilies?

## Inputs

```json
{}
```

## Sources

```json
[
  "C1293",
  "C1282",
  "prep/common_representation_architecture.md"
]
```

## Opened utc

2026-09-28T06:07:03.579213+00:00

## Results

```json
{
  "operation_contract": {
    "path": "model/common_operation_contract.json",
    "sha256": "e962972c99c19ce2c6966eee64b9f8f1763db061720a7d5acc2250dd97a3bc7e",
    "bytes": 754
  }
}
```

## Finding

Anoperationrecord willdescribe itsinputmeasure,source support,outputrole andinformationloss alongsideitsformula. Thisgives apositivecompositionrule: followverifiedinterfaces whose retaineddata match.

## Reassessment

Register theordinaryrowoperations andtheirintermediatedomainrequirements.

## Checks

```json
{
  "fields11": true,
  "three_examples": true
}
```

## Closed utc

2026-09-28T06:07:03.579613+00:00

## Record provenance

Exact record hash: `75ada80ecc7b53bbe4828ce042863843aa01b582252d09f751ea742edf565501`

Source journal: `Research_Cycles/C1132_C1431_Recovered/journal.json`