{
  "status": "Illustrative acceptance plan, not an executable test suite or observed production result",
  "topic": "Rewrite versus incremental modernization",
  "date": "2026-11-04",
  "sourceArticle": "https://aptixlabs.com/insights/saas-rewrite-vs-refactor",
  "setup": [
    "Use synthetic accounts and records",
    "Record the environment and implementation version",
    "Agree the expected product contract before testing"
  ],
  "reviewSequence": [
    "Map current behavior and migration dependencies",
    "Compare a reversible slice with full replacement",
    "Set coexistence rollback and retirement criteria"
  ],
  "cases": [
    {
      "id": "1",
      "condition": "A hidden business rule is discovered",
      "expectedBehavior": "The migration plan accounts for it",
      "observedBehavior": null,
      "status": "not_run"
    },
    {
      "id": "2",
      "condition": "Old and new flows coexist",
      "expectedBehavior": "Data ownership remains explicit",
      "observedBehavior": null,
      "status": "not_run"
    },
    {
      "id": "3",
      "condition": "The new slice fails",
      "expectedBehavior": "A tested recovery path is available",
      "observedBehavior": null,
      "status": "not_run"
    }
  ],
  "tradeoff": "Incremental work can become an indefinite patching programme. Define the modernization outcome and retirement conditions so the team can tell whether the chosen path is actually reducing risk."
}