A winning trade does not prove it was executed well, and a losing trade does not prove it was executed badly. Measuring plan adherence helps separate process quality from financial outcome.
First define what adherence means
Turn ambiguous rules into observable criteria: valid setup, correct risk, permitted session, defined stop, management within rules and no critical mistakes.
How to build a score
You can use a percentage or a checklist of completed conditions. The important part is consistency. If some rules are critical, they may deserve more weight than minor details.
Cross discipline with outcome
Separate at least four groups: winner inside the plan, winner outside the plan, loser inside the plan and loser outside the plan. This helps reveal when the market rewarded a poor decision.
Analyse by strategy and period
You may follow a simple strategy consistently and struggle with another that has more conditions. You can also test whether discipline falls after a loss, late in the session or during streaks.
The goal is not an artificial 100%
A metric is useful only when the rules are well defined. Do not mark everything as compliant simply to improve the score. Use discrepancies to decide which rule needs clarification or practice.