Technical Requirement Document Sample with Template

What is a technical requirement document?

A technical requirement document (TRD) states the technical behavior, constraints, interfaces, and quality conditions a system must satisfy. It gives engineers, product owners, security reviewers, and testers a shared set of statements that can be implemented and verified.

The technical requirement document sample below describes a repository synchronization status feature for a documentation platform. It is filled with realistic values rather than placeholder advice. After the sample, you will find a reusable template and a review checklist.

Technical requirement document sample

Document control

1. Problem statement

Repository owners can start documentation synchronization, but the Space page does not show a stable, shared status. Users cannot distinguish a job that is queued, running, completed, or failed without opening logs or contacting support.

The feature must expose the latest attempt while keeping the last accepted documentation available. A failed refresh must not turn into a reader-facing documentation outage.

2. Goals

• Show the current synchronization state and its timestamp on the Space page.
• Let authorized repository owners retry a failed attempt.
• Preserve the last accepted documentation until a newer candidate passes validation.
• Provide enough structured state for support and monitoring to diagnose stuck attempts.

3. Non-goals

• Redesigning the repository import flow.
• Changing how documentation pages are generated.
• Automatically retrying every failure.
• Showing provider credentials or raw exception messages in the browser.

Non-goals protect the boundary. Without them, a requirements review can turn into an open-ended platform redesign.

4. Actors and permissions

Every server request must authorize the Space and repository for the current tenant. Hiding the Retry button is not an authorization control.

5. State model

not_started -> queued -> running -> completed
                         \-> failed
             queued ----------------> failed

The states mean:

• not_started: no synchronization attempt exists for the repository;
• queued: the request is accepted but no worker has claimed it;
• running: a worker has started processing the attempt;
• completed: the candidate passed validation and became the accepted version;
• failed: the attempt ended without publishing a new accepted version.

completed and failed are terminal for one attempt. A retry creates a new attempt instead of changing the failed record back to queued.

6. Functional requirements

Each requirement has a stable ID so design, implementation, and test evidence can refer to it.

TRD-F-001: Read synchronization status

The system shall return the latest synchronization attempt for each repository visible in a Space.

Acceptance criteria:

• The response includes status, queued_at, started_at, and completed_at where applicable.
• The response identifies the timestamp of the last accepted documentation version separately.
• A caller from another tenant receives 404, not the repository status.

TRD-F-002: Start a synchronization

An authorized repository owner shall be able to start synchronization when no attempt is queued or running.

Acceptance criteria:

• The request creates one queued attempt and returns 202 Accepted.
• Two concurrent valid requests create no more than one active attempt.
• A request while another attempt is active returns 409 Conflict with the active attempt ID.

TRD-F-003: Record worker progress

A worker shall move its claimed attempt from queued to running before processing source files.

Acceptance criteria:

• started_at is written once when the worker claims the attempt.
• A worker cannot update an attempt claimed by another worker.
• The transition is recorded in the application log with the attempt and repository IDs.

TRD-F-004: Publish only accepted documentation

The system shall publish a generated version only after the complete candidate passes required validation.

Acceptance criteria:

• Readers continue to receive the previous accepted version while a new attempt is queued or running.
• A failed candidate never becomes the accepted version.
• Publication and the completed state are committed as one operation.

TRD-F-005: Retry a failed attempt

An authorized repository owner shall be able to retry the latest failed attempt.

Acceptance criteria:

• Retry creates a new attempt linked to the failed attempt.
• Retry is rejected if another attempt is already queued or running.
• The UI keeps the failed attempt visible until the replacement attempt starts.

7. Non-functional requirements

TRD-NF-001: Performance

The status endpoint shall return in under 400 ms at the 95th percentile for a Space containing up to 100 repositories, measured at the application boundary under the agreed load-test profile.

This requirement names a boundary, percentile, data size, and measurement point. “The page must load quickly” cannot be tested consistently.

TRD-NF-002: Availability

Failure of the synchronization queue or repository provider shall not prevent readers from opening the last accepted documentation.

TRD-NF-003: Security

The public status response shall not include access tokens, clone URLs containing credentials, absolute server paths, or raw exception traces.

TRD-NF-004: Observability

The system shall emit metrics for queued attempts, running attempts, failures by normalized reason, completion duration, and oldest running age. Alerts shall identify an owner and link to a recovery runbook.

TRD-NF-005: Retention

Synchronization attempts shall be retained for 90 days. The latest attempt and latest accepted version metadata shall remain available while the repository exists.

These values are sample product decisions. A real technical requirements document should use targets approved for its system rather than copying them unchanged.

8. Data requirements

SyncAttempt
- id: UUID
- repository_id: UUID
- previous_attempt_id: UUID, nullable
- status: queued | running | completed | failed
- queued_at: timestamp
- started_at: timestamp, nullable
- completed_at: timestamp, nullable
- failure_code: string, nullable
- worker_job_id: string, nullable
- accepted_version_id: UUID, nullable

Required invariants:

• a repository has at most one queued or running attempt;
• started_at is present for running, completed, and worker-started failed attempts;
• completed_at is present for terminal states;
• failure_code is present only for failed attempts;
• accepted_version_id is present only when publication succeeded.

9. External interfaces

GET  /api/spaces/{spaceId}/repositories/{repositoryId}/sync-status
POST /api/spaces/{spaceId}/repositories/{repositoryId}/syncs
POST /api/spaces/{spaceId}/repositories/{repositoryId}/syncs/{attemptId}/retry

The API documentation must define request bodies, response schemas, authentication, errors, idempotency, and rate limits. Requirements identify the contract that must exist; the API reference documents its exact wire format.

10. Failure behavior

11. Rollout and rollback requirements

1. Add the status model without changing the reader path.
2. Write status records while keeping current logs.
3. Backfill only the last accepted timestamp where evidence exists.
4. Compare status records with worker logs before enabling the UI.
5. Enable status display for an internal cohort, then a small customer cohort.
6. Roll back the UI independently; retain status records for later diagnosis.

The rollout must pause if accepted documentation becomes unavailable, cross-tenant access is observed, or duplicate active attempts exceed the defined tolerance of zero.

12. Open questions

• Should repository owners receive a notification after repeated failures?
• Which normalized failure codes are safe to show publicly?
• Does manual cancellation belong in the first release?

Each open question needs an owner and decision date before implementation reaches the affected behavior.

Requirements traceability matrix

A traceability matrix connects the requirement to design and proof:

Do not create the matrix as paperwork after development. Use it during review to find requirements that have no owner, design path, or verification.

Reusable technical requirement document template

# Technical requirement document: [system or feature]

Owner:
Reviewers:
Status:
Version:
Last reviewed:

## Problem
Describe current behavior and affected users.

## Goals
- Measurable outcome

## Non-goals
- Explicitly excluded behavior

## Actors and permissions
Define who can read, create, update, approve, or operate the system.

## State model
List states, transitions, terminal states, and invalid transitions.

## Functional requirements
### TRD-F-001: [Name]
The system shall...

Acceptance criteria:
- Observable result
- Failure or boundary case

## Non-functional requirements
Define measurable performance, availability, security, privacy,
accessibility, observability, and retention requirements.

## Data and interfaces
Document entities, invariants, APIs, events, and external dependencies.

## Failure behavior
For each likely failure, define system behavior and recovery ownership.

## Rollout and rollback
List compatibility steps, verification, pause conditions, and rollback.

## Traceability
Map each requirement to design, implementation, and verification.

## Open questions
Assign an owner and decision date.

How to write requirements that can be tested

Use stable IDs and observable language. In formal specifications, capitalized terms such as MUST and SHOULD have defined meanings under RFC 2119, but ordinary product documents often use “shall” or direct statements as long as the team applies them consistently.

Compare these pairs:

Specific requirements expose tradeoffs early. They also make it obvious when a target has not been agreed.

Review checklist

Before approving a technical requirements document, confirm that:

• the problem and non-goals define a real boundary;
• actors and permissions include cross-tenant behavior;
• every functional requirement has observable acceptance criteria;
• non-functional targets name a measurement method and operating range;
• data invariants and state transitions are explicit;
• errors and partial failures have defined behavior;
• rollout includes verification, pause conditions, and rollback;
• requirements map to a design owner and verification method;
• unresolved questions have owners;
• the review date reflects an actual review.

This technical requirement document sample focuses on one feature so its statements remain traceable. Larger programs can link several requirement documents to a shared architecture and glossary instead of creating one file that no reviewer can hold in context.

DocuWriter can generate and manage structured technical documentation from connected repositories, including architecture, modules, services, classes, functions, dependencies, APIs, diagrams, READMEs, and other codebase components. Requirements still need product and engineering ownership because source code cannot tell you which future behavior stakeholders intend to approve.