Short Answer

When should post-launch user data be used to refresh dev and test sets?

Question: Answer in one to three sentences: After a product has shipped, when is it appropriate to use real user data to revise the dev and test sets, and which sets may be refreshed?

Sample answer: Once the app is live and you have collected real user behavior, you may rebuild or update both the development set and the test set.

Key points:

  • After launch
  • Using real user data
  • Updating both development and test sets

Rubric: The answer must mention that the app is already launched, that the data comes from actual users, and that both the dev set and the test set can be updated.

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Updated 2026-08-12

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