Build your own trading system
Turn a vague idea into repeatable rules
Read
A system is a written set of rules that answers what you trade, when you get in, when you get out and how much you risk. Without one you improvise — and improvising under pressure is how accounts die.
AI Mentor here. 🧠 Ask a struggling trader what their system is and you usually get a description of a *style*: "I trade breakouts", "I follow the trend". Those are themes, not systems. A system is specific enough that it answers yes or no when you are staring at a live chart with money on the line.
That is the entire point of writing it down. It replaces mood with method, so the same setup gets the same response on a good day and a bad one.
The five parts
Every complete system answers five questions. Miss one and what you have is a preference, not a system.
1 — Markets & timeframe: what you trade and on which chart. 2 — Entry rules: the exact conditions that trigger a trade. 3 — Exit rules: where you take profit AND where you stop out. 4 — Risk per trade: how much of the account is at stake (1–2%). 5 — Review: how you journal and measure results.
Notice that two of the five are about getting out and one is about looking back. Most people write the entry rules and stop there, which is why most people have a system that can only tell them when to start losing money.
Make the rules objective
A rule is only a rule if two people reading it would take the same trade. That is the whole test, and it is brutally effective.
"Buy when it looks strong" fails it — every reader sees something different. "Buy when price closes above the 50-EMA and RSI is above 50" passes: it can be followed under pressure, argued about honestly, and tested against history.
If a rule needs interpretation, it is a wish. Write rules a robot could follow.
Read your rules out loud and count the adjectives. "Strong", "clean", "obvious" and "good" are where the interpretation hides. Replace each one with a number or a condition and the system suddenly becomes testable.
Prove it before you fund it
Objective rules unlock something subjective ones never can: evidence. Backtest them across enough history to see how the system behaves in trends, in ranges and in the ugly stretches. Then trade them on a demo account, where the rules meet real-time uncertainty and your own hesitation.
Only after both should real money go in — and even then, at the small end of your risk range while you build the sample.
Keep it simple, then stick to it
A simple system you actually follow beats a sophisticated one you abandon in month two. Start with a handful of clear rules, trade them consistently for a meaningful number of trades, and change them only on the evidence of your journal.
Never rewrite a system because of one bad trade, and never rewrite it while you are annoyed. A single loss tells you almost nothing; fifty trades tell you almost everything.
A system followed loosely produces data you cannot learn from — you never know whether the rules failed or you did. Following them exactly, even through a losing run, is what turns your results into information.
Write the five parts down today, even roughly. A written system you can criticise beats a brilliant one that only exists in your head. ⚙️