Pathwise

Manuals / Problem Solving / Chapter 4

B · Experiment · intermediate · ~35 min · Chapter 4 of 9

Hypothesize, test, learn

If X is true, we should see Y. Run the cheapest experiment first. Invalidate fast.

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Step 1 of 2

3 hypotheses for a bug

Write 3 possible causes. Rank by likelihood × cost to test.

3 hypotheses for a bugDrag stickies · tap for tips
Study mapDrag stickies · tap for tipsKeep it shortdrag · tap →Name the waitdrag · tap →Scope locatorsdrag · tap →Trace when stuckdrag · tap →One browser firstdrag · tap →Isolate statedrag · tap →Assert the UIdrag · tap →Retry wiselydrag · tap →Seed datadrag · tap →Close the loopdrag · tap →Keep it shortdrag · tap →Name the waitdrag · tap →Scope locatorsdrag · tap →Trace when stuckdrag · tap →One browser firstdrag · tap →Isolate statedrag · tap →Pathwise hackdrag · tap →3 hypotheses for adrag · tap →Try thisdrag · tap →Follow the dashed drag · tap →

Do this now

Pick a bug. Write 3 hypotheses. Test the cheapest.

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Chapter learning outcomes
  • Hypothesis format
  • Cheap experiments
  • Timeboxes

Clear these before you leave

Side quest

Rubber duck log

Explain a stuck problem out loud. Note what unlocked it.