Identify variables that actually vary
Choose nouns that can rise or fall within days or weeks: sleep quality, study minutes, snack frequency, backlog size, motivation level, screen time, savings balance. Avoid vague labels like “success” or “happiness” at first; instead, prefer observable, trackable measures. Ask, if this changed by ten percent, would I notice within a short period? This discipline keeps your diagram empirical, experiment-friendly, and easy to validate with quick notes, timers, or simple counts.