> ## Documentation Index
> Fetch the complete documentation index at: https://docs.integratewise.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Product Engineering Business Context: Entities and Relationships

> Entities, events, and evidence that shape the Product Engineering domain and how they relate across the delivery lifecycle.

The Product Engineering domain is built on a connected graph of entities that represent work, code, and operations. Spine Fabric unifies these from source systems so every relationship is queryable and actionable.

### Entities and Relationships

| Entity      | Related To                  | Relationship                                             |
| ----------- | --------------------------- | -------------------------------------------------------- |
| Epic        | Issue, Roadmap              | Epic groups issues; Roadmap groups epics by target date. |
| Issue       | Epic, PullRequest, Incident | Issue links to code changes and operation events.        |
| PullRequest | Issue, Release              | PR resolves issues and rolls up into a release.          |
| Release     | PullRequest, Incident       | Release contains PRs and may be linked to incidents.     |
| Incident    | Release, Issue              | Incident traces to the release or ticket that caused it. |
| Sprint      | Issue, Epic                 | Sprint scopes work for a timeboxed period.               |
| Feature     | Figma File, Issue           | Feature spans design and engineering work.               |
| Roadmap     | Epic, Feature               | Roadmap orders initiatives by priority and timeline.     |

### Key Events

* Issue created, status changed, assigned
* Pull request opened, reviewed, merged
* Release published, deployed, rolled back
* Incident triggered, acknowledged, resolved
* Sprint started, ended

### Evidence

* Commit messages, CI results, deployment logs
* Design annotations, meeting notes, post-mortem write-ups

### Related

* [Domain Views](/internal-docs/domains/product-engineering/domain-views)
* [Spine Fabric](/internal-docs/domains/product-engineering/spine-fabric)
* [System Flow](/internal-docs/domains/product-engineering/system-flow)
* [How It Works: Governed Actions](/how-it-works/governed-actions)
* [Domains Overview](/internal-docs/domains/overview)