> ## Documentation Index
> Fetch the complete documentation index at: https://docs.spineworkspace.com/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)


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