REFERENCE ARCHITECTURE 04 / 09

Change without betting the business.

Visible dependencies, staged migration and credible rollback.

SYSTEM BOUNDARIES

Where responsibility changes.

01Inventory

02Migration seam

03Parallel validation

04Cutover + rollback

Four design boundaries. The specific technology stack, data rights and operating model depend on the real environment.

DESIGN EXERCISE / FAILURE LAB

Choose a realistic failure condition to inspect a defensible response and the verification evidence it would require.

SELECT A FAILURE MODE

Scenario responses are authored reference examples and have not been measured in a customer environment.

RESPONSE CONTRACT01 / 02

Architecture response

HOW TO VERIFY

Shadow comparisons and signed exception review.

TRADE-OFF TO ACCEPT

A reversible migration temporarily duplicates infrastructure effort.

BACK TO PRACTICE