Discipline
The ability to follow your trading plan exactly — without deviation — regardless of how you feel in the moment.
Mark Douglas, in Trading in the Zone, argued that 90% of trading success is psychology and discipline, not strategy. Two decades later, the prop firm boom validated his thesis — most prop firms eliminate traders for discipline failures (not strategy failures) every single month.
Related terms
Patience
beginnerThe willingness to wait for high-quality setups instead of forcing trades — the rarest skill in retail trading.
Process Over Outcome
intermediateThe mindset of judging trades by whether you followed your plan, not by whether the trade was profitable.
Loss Aversion
intermediateThe psychological tendency to feel losses about twice as intensely as equivalent gains — drives bad exits and held losers.
Overtrading
beginnerTaking too many trades — usually driven by boredom, FOMO, or revenge — and bleeding capital through commission, spread, and forced setups.
Tilt
beginnerThe emotional state where you're trading from anger, fear, or frustration instead of your plan — the precursor to blowing up your account.
FOMO
beginnerFear Of Missing Out — the urge to chase a move that's already running, usually resulting in buying the top or shorting the bottom.