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Is the Impact Analysis for Significant Changes Being Conducted Properly?

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アーキテクチャ設計
設計レビュー
SaaS 設計
変更管理
影響分析
tech

Is impact analysis for major changes being conducted appropriately?

Background & Overview

For major changes such as schema modifications, authorization processes, or core domain logic, it is necessary to conduct impact analysis not just on the technical side, but across all areas, including users, operations, and Customer Support (CS).

If the scope of impact is clearly defined, risk assessment during design reviews can proceed smoothly.

Examples

  • Listing the scope of impact for changes to the document database structure, such as document management, search APIs, and various notification processes.
  • Documenting everything from checking actionable roles to handling translations and updating notification text when changing authorization flow logic.
  • Including the name of the person who confirmed the "No impact" items to serve as a trail of who made the assessment.

Common Pitfalls

  • Inconsistencies arising because old schema reference logic was left behind on a specific screen.
  • Overlooking the impact on translations and email templates, leading to incorrect displays for international users.
  • API changes causing third-party integrations to fail, only discovered after the fact.

FAQ

Q. Can I omit items with "No impact"?

A. No, it is actually quite important to explicitly state "No impact (confirmed)" so that it cannot be confused with items that were simply overlooked during the review.

Q. Who performs the impact analysis?

A. Primarily, the designer should start it. It should then be compiled into a list for review from the perspectives of each team (including QA, CS, etc.).

📘 This article is part of the SaaS Design Review Perspective Checklist (2025 Edition).

Design perspective category: 🚀 Release & Rollback
Level: DeepDive (Implementation/Operational level)
Recommended readers: Design Leaders / SREs / Infrastructure Designers / Reviewers

🧭 You can find other perspectives summarized here.

Discussion