Insights Psychology

A trading journal that actually changes behaviour

28 Jun 2026 · 6 min read

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Illustration for the guide "A trading journal that actually changes behaviour" — a lone trader sitting calmly in front of glowing screens in a dark room.
Psychology guide: Most journals record what happened.

Most journals record what happened. A useful one records why, and produces one measurable change per week.

Key takeaways

  • Log the plan and the deviation, not just entry, exit and P&L.
  • Review weekly with one question: which rule did I break most often?
  • Change exactly one behaviour per week so the effect is measurable.

A journal that lists entry, exit and profit is a statement, not a tool. Your broker already provides that. The useful columns are: what was the plan, did I follow it, and what was I feeling when I deviated.

Tag every trade as planned or unplanned. Over a month this single column usually explains most of the P&L distribution — for most struggling traders, the planned trades are profitable and the unplanned ones consume the profit.

Review weekly rather than daily. Daily reviews inherit the emotion of the session; weekly reviews see patterns. Ask one question: which rule did I break most often, and what condition preceded it?

Then change one thing. One rule, one week, measured. Traders who rewrite their entire process every weekend never accumulate evidence about anything.

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