# Phase 1

## Purpose

Phase 1 defines the technical decision-making framework that must be completed before implementation begins. This phase is about making and documenting core technical choices in a clear order so future work follows shared decisions rather than assumptions.

## Scope

Phase 1 establishes how technical and architectural decisions will be recorded, reviewed, and used to guide later implementation tasks.

## In Scope

- defining the major technical decisions required before implementation
- documenting architecture decisions in a durable repository-owned form
- establishing the relationship between architecture overview documents and ADRs
- clarifying the minimum decision set required before implementation starts

## Out of Scope

Until the phase-1 decision framework is complete, do not:
- start application implementation
- introduce runtime services
- choose implementation details that depend on unresolved architecture decisions
- expand into feature delivery work
- treat undocumented assumptions as approved decisions

## Expected Outputs

Phase 1 should produce:
- a maintained phase-1 decision plan
- a central architecture overview document
- a set of ADRs covering major technical choices
- clear implementation preconditions for the next phase

## Decision Order

Make decisions in this order:

1. Define the required decision areas.
2. Record the ADR process and naming conventions.
3. Establish the architecture overview and its relationship to ADRs.
4. Document major technical decisions in ADRs.
5. Confirm that implementation-critical choices are explicit and aligned.

## Exit Criteria for Phase 1

Phase 1 is complete when:
- the decision framework is documented
- the architecture overview exists and points to ADRs
- required major technical decisions are recorded as ADRs
- implementation can begin without relying on undocumented assumptions