What if failure wasn't the enemy — but slow failure was? The pro doesn't avoid failure. They design it to be fast and cheap.

Week 3 gave you three tools: test assumptions early, optimize for learning speed, and set kill criteria before you start.

These three principles aren't separate — they form the Testing Loop. Test → Learn → Kill or Scale. That loop compounds over a career.

Imagine a founder who spent 18 months building before talking to a single customer. One week of cheap tests would have saved the year.

The common pitfall: running experiments with no pre-set learning goal. You must decide WHAT you're testing before you test it.

The testing loop is not pessimism about your ideas. It's optimism about your ability to find out the truth before it costs you everything.

This week's insight: the pro designs fast, cheap failures that generate wisdom. Now let's close the loop on YOUR experiments.

Today's practice: answer 3 questions about an experiment you ran — or could run — this week. Pen and paper ready.

Question 1: What assumption did you test? Name it precisely. 'Customers will pay more' is too vague. 'Customers over 40 will pay $49' is a test.

Question 2: What did you learn? Then Question 3: Kill, scale, or iterate — and why? Write one sentence for each. No paragraphs needed.

If you haven't run an experiment yet, write the one you SHOULD run this week. Describe the assumption, the test, and your kill criteria now.

Every answered question sharpens the needle. Three weeks in — and your compass now shows both halves of the truth: inside and out.