Running a Personal Experiment

Last lesson you identified an untested assumption about your life. Today you turn it into a real experiment and start running it.

This is where most people bail. They like the idea of personal science but skip the doing. Understanding the method is easy. Using it requires discipline — the same discipline you’ve been building since the start of Level 6.

From Assumption to Hypothesis

An assumption is vague. A hypothesis is specific and testable.

Assumption: “I think coffee makes me anxious.” Hypothesis: “If I stop drinking coffee for 14 days, my anxiety rating will decrease by at least 2 points on a 1-10 scale.”

See the difference? The hypothesis has a specific intervention, a specific timeline, a specific metric, and a specific threshold. You’ll know at the end whether it was supported or not.

A hypothesis doesn’t have to be right. In fact, being wrong is just as useful. If coffee isn’t causing your anxiety, that’s valuable information — you can stop blaming coffee and look at the real cause.

Designing Your Experiment

Take the assumption you identified yesterday. Now build the experiment.

1. Observation: What am I currently seeing?

Write down the current state. Be specific. “I feel tired most afternoons” needs to become “My energy rating at 3 PM has averaged about 4/10 for the past week.”

2. Question: What do I want to know?

State it clearly. “Does my lunch affect my afternoon energy?”

3. Hypothesis: State your testable prediction.

“If I [specific change], then [specific outcome] will change by [specific amount] over [specific timeframe].”

4. Test design: What exactly will you do?

“For 14 days, I will [intervention]. I will keep everything else the same as much as possible.”

The “everything else the same” part is critical. If you change your lunch and your sleep schedule and your exercise routine, you’ll have no idea what caused the result. One variable.

5. Data plan: How will you track results?

“I will record [specific metric] at [specific time] every day using [specific method].”

Keep data collection simple. A number in a note on your phone is fine. A detailed spreadsheet that takes 20 minutes is overkill and you’ll quit after three days.

Begin Today

Don’t wait until conditions are perfect. Start with what you have. Your hypothesis doesn’t need to be sophisticated. Your tracking method doesn’t need to be elegant. It needs to exist and it needs to be consistent.

Set a minimum duration of two weeks. Anything shorter and you’re measuring noise, not signal.

Write down your complete experiment design:

• Hypothesis: ____
• Intervention: ____
• Duration: ____
• Metric: ____
• Tracking method: ____

Then start. Record today’s baseline measurement. You’re running your first personal experiment.