Short Answer

Create the First Dev/Test Set and Metric Quickly

Question: How soon should a team define an initial dev/test set and evaluation metric when launching a brand-new machine learning project?

Sample answer: The team should set them up very early, ideally within the first week and often sooner.

Key points:

  • Do this at the start of a new project
  • Aim for less than one week
  • This guidance is for new applications, not mature ones

Rubric: Full credit requires a clear statement that the initial dev/test set and metric should be created in under a week, or very early in the project. Partial credit gives an imprecise or incorrect timeframe.

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Updated 2026-08-12

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