Architecture Decision Framework
Overview
The Architecture Decision Framework provides a systematic approach for making architectural decisions. It ensures decisions are well-considered, documented, and aligned with organizational goals.
This framework covers the entire decision lifecycle:
- Decision identification and framing
- Stakeholder consultation
- Evaluation of options
- Risk assessment
- Documentation via ADRs
- Review and approval
- Implementation and monitoring
Core Principles
Transparency
- Document reasoning and alternatives
- Make decisions visible to stakeholders
- Clear communication of rationale
Evidence-Based
- Gather data before deciding
- Use metrics and analysis
- Consider past experiences
Inclusive
- Involve relevant stakeholders
- Seek diverse perspectives
- Balance different viewpoints
Documented
- Record decisions and context
- Create Architecture Decision Records (ADRs)
- Maintain decision history
Reversible When Possible
- Consider decision reversibility
- Build in flexibility
- Plan for changes
Decision Classification
By Impact Level
Strategic Decisions
- Affect entire organization
- Multi-year consequences
- High financial impact
- Examples: Technology platform choice, organizational restructure
Tactical Decisions
- Affect team or department
- 6-12 month scope
- Moderate impact
- Examples: Framework selection, deployment strategy
Operational Decisions
- Affect specific project/component
- Short-term scope (weeks-months)
- Local impact
- Examples: Library version, coding pattern
By Reversibility
Reversible Decisions
- Can be changed with reasonable effort
- Lower risk to reverse
- Quick decision process acceptable
- Examples: Internal tool selection, naming conventions
Irreversible Decisions
- Difficult/expensive to change
- High impact if wrong
- Requires thorough evaluation
- Examples: Architecture patterns, vendor selection
By Frequency
One-Time Decisions
- Made once
- Significant impact
- Examples: Technology stack selection
Recurring Decisions
- Made repeatedly
- Need decision templates
- Examples: Technology evaluation, vendor assessment
Decision-Making Process
Phase 1: Decision Identification & Framing
Activities:
- Identify the decision needed
- What decision must be made?
- Why is it needed?
- What triggers this decision?
- Define decision scope
- What’s in scope?
- What’s out of scope?
- Affected components/teams
- Establish timeline
- When is decision needed?
- How much time for evaluation?
- Implementation deadline
- Classify the decision
- Strategic/Tactical/Operational?
- Reversible/Irreversible?
- Who needs to decide?
Output: Decision charter or brief
Example:
Decision: Select primary cloud platform for new microservices platform
Scope:
- Compute, networking, storage, databases
- Not included: On-premises resources, legacy systems
Timeline:
- Evaluation: 4 weeks
- Decision: Week 5
- Implementation starts: Week 6
Classification:
- Strategic (multi-year, org-wide)
- Irreversible without significant cost
- Enterprise Architect to decide with steering committee input
Phase 2: Stakeholder Identification & Consultation
Key Stakeholders:
- Decision maker (who decides)
- Influencers (provide input)
- Affected parties (impacted by decision)
- Subject matter experts (provide expertise)
Consultation Activities:
1. Kickoff Meeting
- Present decision context
- Explain decision process
- Set expectations and timeline
- Identify evaluation criteria
2. Input Gathering
- Questionnaires/interviews
- Focused workshops
- Technical deep dives
- Business case analysis
3. Feedback Sessions
- Share analysis progress
- Present preliminary findings
- Gather reactions
- Refine options
Stakeholder Template:
Role Name/Team Input Required
Decision Maker CTO/Enterprise Arch Final decision
Influencers Product, Ops, Sec Requirements/constraints
Domain Expert Tech Lead Technical feasibility
Business Rep Product Manager Business alignment
Risk Manager Security/Compliance Risk assessment
Phase 3: Option Evaluation
1. Generate Options
- Brainstorm possible solutions
- Research industry approaches
- Consider proven alternatives
- Don’t eliminate too early
2. Define Evaluation Criteria
Functional Criteria:
- Meets requirements
- Technical capabilities
- Feature completeness
Non-Functional Criteria:
- Performance (latency, throughput)
- Scalability (growth capacity)
- Reliability (uptime, recovery)
- Security (encryption, compliance)
- Cost (initial, operational, maintenance)
- Maintainability (support, documentation)
Strategic Criteria:
- Alignment with strategy
- Build internal capabilities
- Vendor stability
- Ecosystem strength
Example Evaluation Matrix:
| Criteria | Weight | Option A | Option B | Option C |
|---|---|---|---|---|
| Performance | 25% | 9/10 | 8/10 | 7/10 |
| Scalability | 20% | 8/10 | 9/10 | 9/10 |
| Cost | 15% | 7/10 | 5/10 | 9/10 |
| Security | 20% | 8/10 | 9/10 | 6/10 |
| Support | 10% | 8/10 | 7/10 | 5/10 |
| Learning Curve | 10% | 6/10 | 7/10 | 9/10 |
| Total | 100% | 7.95 | 7.85 | 7.65 |
3. Evaluate Each Option
- Research thoroughly
- Build proof of concepts if needed
- Compare against criteria
- Document findings
4. Risk Analysis
- Identify risks for each option
- Assess probability and impact
- Develop mitigation strategies
- Consider risk tolerance
Risk Template:
Option: AWS
Risk Probability Impact Mitigation
Vendor lock-in High High Architecture for multi-cloud
Cost overage Medium High Cost monitoring, alerts
Learning curve Medium Medium Training program
Regional availability Low High Multi-region design
Phase 4: Decision Making
Decision Criteria:
Consensus (preferred)
- All stakeholders agree
- Best for strategic decisions
- Takes more time
Consent (acceptable)
- Stakeholders may not agree but support decision
- Good for most decisions
- Clear rationale required
Consultation (acceptable)
- Decision maker consults but decides
- Good for time-sensitive decisions
- Document dissenting views
Authority (last resort)
- Decision maker decides unilaterally
- Use when time critical
- Still document reasoning
Making the Decision:
1. Present analysis to decision maker
2. Highlight strengths/weaknesses
3. Present recommendation (if applicable)
4. Document dissenting views
5. Gain decision approval
6. Communicate decision
7. Document decision rationale
Phase 5: Documentation (ADR)
Create an Architecture Decision Record (ADR):
# ADR-001: Select AWS as Primary Cloud Platform
## Status
Accepted
## Context
Company expanding microservices platform, needs reliable cloud infrastructure.
Evaluated 3 options: AWS, Azure, GCP. Strategic importance to organization.
## Decision
Select AWS as primary cloud platform for new microservices platform.
## Rationale
1. **Performance**: AWS EC2 and Lambda provide best latency for our use cases
2. **Scalability**: Auto-scaling groups and managed services enable growth
3. **Cost**: Reserved instances provide 40% savings vs on-demand
4. **Ecosystem**: Largest community, most third-party integrations
5. **Security**: SOC 2 Type II certified, excellent security features
## Alternatives Considered
### Azure
- Strengths: Good for hybrid scenarios, strong .NET ecosystem
- Weaknesses: Higher costs for specific workloads, smaller community
### GCP
- Strengths: Excellent data analytics, strong ML capabilities
- Weaknesses: Smaller marketplace, less enterprise support
## Consequences
### Positive
- Team gains AWS expertise (valuable skill)
- Access to comprehensive AWS ecosystem
- Good cost optimization opportunities
### Negative
- Vendor lock-in for certain services
- Need to learn AWS-specific tools and practices
- Training investment required
## Implementation Plan
1. Establish AWS landing zone (Month 1)
2. Train teams on AWS best practices (Month 1-2)
3. Migrate first service to AWS (Month 2-3)
4. Scale to full platform (Month 4+)
Phase 6: Review & Approval
Review Checklist:
- Decision properly framed
- All relevant stakeholders consulted
- Alternatives fairly evaluated
- Risk assessment complete
- ADR clearly documented
- Implementation plan developed
- Success metrics defined
- Stakeholder alignment confirmed
Approval Process:
- Assign to reviewer (peer review)
- Technical review (if applicable)
- Risk review (if high risk)
- Final approval by decision maker
- Publish decision
Phase 7: Implementation & Monitoring
Implementation:
- Create implementation plan
- Assign owners and timelines
- Monitor progress
- Manage change management
Monitoring:
- Track success metrics
- Monitor for issues
- Gather feedback
- Document lessons learned
Decision Review:
- Revisit decision at set intervals
- Assess if still valid
- Identify needed adjustments
- Plan for reversibility if needed
Decision Velocity
Balance thoroughness with speed:
Quick Decisions (1-2 weeks)
- Low risk, reversible
- Operational level
- Limited stakeholder input needed
Normal Decisions (2-4 weeks)
- Moderate risk/impact
- Tactical level
- Standard stakeholder consultation
Thorough Decisions (4+ weeks)
- High risk, strategic
- Irreversible
- Deep analysis needed
Common Pitfalls & Mitigation
| Pitfall | Impact | Mitigation |
|---|---|---|
| Analysis paralysis | Slow decisions | Set decision deadline |
| Stakeholder conflicts | Poor alignment | Facilitate early discussion |
| Missing alternatives | Suboptimal choice | Brainstorm broadly |
| Incomplete risk analysis | Surprises later | Structured risk assessment |
| Poor documentation | Lost context | Use ADR template |
| No decision review | Decisions stick too long | Schedule review meetings |
| Reversibility ignored | Can’t adapt | Classify decisions upfront |
Decision Templates
Quick Decision Template
Title: [Decision Title]
Timeline: [Days to decide]
Impact: Low/Medium/High
Reversible: Yes/No
Options:
1. [Option A]
2. [Option B]
Recommendation: [Recommendation]
Rationale: [Brief explanation]
Owner: [Decision maker]
Comprehensive Decision Template
# Decision: [Title]
## Context
[Background, trigger, constraints]
## Decision Needed
[What specifically must be decided]
## Options
[List all credible options]
## Evaluation
[Criteria, scoring, analysis]
## Risks
[Identified risks and mitigation]
## Recommendation
[Recommended option with justification]
## Approval
[Approver, date, sign-off]
## Implementation
[Plan, timeline, owners, success metrics]
Tools & Templates
Decision Management Tools:
- ADR Framework - Documenting decisions
- Decision-Process - Detailed process steps
- Technology-Evaluation - Tech-specific evaluation
- Risk Assessment Guide - Risk analysis
Templates Available:
- Decision charter template
- Stakeholder analysis template
- Evaluation matrix template
- ADR template
- Risk register template
Related Processes
- Architecture Review Board (ARB) - Governance of decisions
- Decision Process - Step-by-step implementation
- ADR Framework - Documentation standard
- Technology Evaluation - Evaluating technologies
- Change Management - Managing impacts
Best Practices
✅ Document all decisions Create ADRs for all architectural decisions.
✅ Involve stakeholders early Don’t surprise teams with decisions.
✅ Use evaluation criteria Make decisions objective and defensible.
✅ Assess risks thoroughly Understand consequences before deciding.
✅ Set decision deadlines Avoid analysis paralysis.
✅ Review decisions periodically Revisit if context changes.
✅ Make reversible decisions reversible Build flexibility into design.
✅ Communicate clearly Ensure everyone understands decision and rationale.
❌ Don’t make decisions in isolation Decisions affect the whole organization.
❌ Don’t ignore dissenting views Document and consider alternative perspectives.
❌ Don’t skip documentation Future teams need to understand the why.
❌ Don’t make irreversible decisions lightly Take time for high-impact decisions.
Metrics & Success
Decision Quality Metrics:
- Decisions made on time (% of decisions meeting deadline)
- Stakeholder satisfaction (survey after decision)
- Decision reversals (% of decisions that needed revision)
- Time to decision (days from identification to approval)
- Documentation completeness (% of decisions with ADRs)
Process Metrics:
- Stakeholder participation (% involved in consultation)
- ADR coverage (% of architectural decisions documented)
- Review turnaround (days for approval)
- Implementation adherence (% of decisions implemented as approved)
Governance
Decision Authority Matrix:
| Decision Type | Authority | Escalation |
|---|---|---|
| Operational | Team Lead | Director |
| Tactical | Manager/Lead Architect | VP Engineering |
| Strategic | CTO/Enterprise Architect | CEO/Board |
Review Schedule:
- Operational: As needed
- Tactical: Monthly architecture forums
- Strategic: ARB meetings (bi-weekly)
Related Resources
- ADR Framework - Documenting decisions
- Decision Process - Implementation workflow
- Architecture Review Board - Decision governance
- Technology Evaluation - Evaluating technologies
- Change Management - Managing change impacts
References
- Decisive: How to Make Better Choices in Life and Work (Heath & Heath)
- The Goal: A Process of Ongoing Improvement (Goldratt)
- Decision Quality (Wikipedia)
Last Updated: November 2025 Maintained By: Enterprise Architecture Team Version: 1.0