Explaining application network basics7% of the exam
API Tier Ownership and Change
Classify APIs by the responsibility they expose, then interpret ownership and change as supporting evidence rather than automatic tier labels.
Correctly assign APIs to tiers according to ownership, functional focus, and rate of change.
~5 min read · 6 practice questions
What the exam expects
- Classify APIs by system access, business composition or consumption needs.
- Use team ownership and change drivers to interpret the API's purpose.
- Distinguish implementation changes from changes in exposed responsibility.
- Recognize that an architectural layer and an ownership arrangement are different decisions.
A System API exposes core-system capabilities; a Process API composes reusable business capabilities; an Experience API adapts information for consumption; ownership assigns accountability; a change driver explains why a contract or implementation evolves (API-led essentials, API ownership).
Key facts
System focus
- Detail
- Expose core capabilities behind a stabilizing boundary.
Process focus
- Detail
- Reusable composition includes aggregation and enrichment.
Experience focus
- Detail
- Adapt information for particular consumption needs.
Reuse
- Detail
- Purposeful components can contribute to later applications.
Role staffing
- Detail
- One person may hold business and technical ownership.
Supporting APIs
- Detail
- An API without a direct business function may lack a business owner but still needs technical ownership.
Cultural fit
- Detail
- Ownership arrangements should account for organizational norms.
- Why do two ownership role labels not prove that two people must be appointed?
- When might an API have no business API owner while still needing technical ownership?
- What organizational consideration can outweigh adopting a preferred collaborative ownership pattern?
The questions are free to read. Answers with their sources and self-grading are included with the pack.
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