01State the decision

What decision must be made, by whom, and by when?

02Describe the problem

Name the audience, situation and difficulty. Separate observations from assumptions.

03Write a testable assumption

We believe [change] helps [audience] achieve [outcome]. What evidence would contradict this?

04Design the smallest test

Choose a prototype or conversation, participants, task, observation method and limitations.

05Set a decision rule

Before testing, define proceed, revise and stop signals. Record results and the next owner.

Set a seven-day review date

What worked? What failed?

Record evidence, errors and uncertainty.

What will you change?

Choose Continue, Revise, Stop or Gather more evidence.