Who it is for — Traders who want to know whether they executed a stated process without allowing the profit or loss from one trade to rewrite the evaluation.
Plan adherence measures the correspondence between a rule defined before a decision and the behavior actually observed. It does not directly measure plan quality or guarantee profitability: a weak plan can be followed precisely, while a sound decision under uncertainty can have a negative outcome.
For a rule to be assessable, it should specify at least a condition, an action, and evidence. For example: "If the daily loss reaches the stated limit, then I stop opening new positions; the journal records the time and account state." This format resembles implementation intentions studied in self-regulation research, but using it does not validate a financial strategy.
Unit of observation
Do not reduce the review to one yes/no label per trade. A trade can contain several assessable decisions: entry eligibility, size, stop management, additions, exit, and session limits. Before the session, identify which rules are critical: a risk-limit breach should not be hidden by compliance with minor steps.
| Class | Criterion | Treatment in the report |
|---|---|---|
| Compliant | Applicable rule and matching action | Included in numerator and denominator |
| Documented exception | Predefined exception or recorded evidence | Reported separately |
| Breach | Deviation without a documented exception | Included in denominator, not numerator |
| Not assessable | Vague rule or insufficient data | Excluded from the ratio but counted as a data-quality issue |
The basic formula is:
strict adherence = compliant decisions / assessable decisions × 100
There is no universal percentage that makes a trader "disciplined." State the denominator, rules, period, and exceptions; compare like-for-like windows and never use the metric as a profit forecast.
Practical checklist
- Was the rule written before the decision?
- Was it applicable to that context and product?
- Was the planned action precise enough to verify?
- Is there a record: order, timestamp, screenshot, or journal note?
- Was any exception predefined or documented with evidence?
- Was the financial outcome evaluated in a separate field?
Example without a promise
In a review of 20 decisions, 15 are compliant, 2 are documented exceptions, 2 are breaches, and 1 is not assessable. If 19 decisions are assessable, strict adherence is 15/19, approximately 78.9%. The report should also show exceptions, critical breaches, and the missing case.
That 78.9% does not establish whether the trading plan has an edge, whether risk is sustainable, or whether the sample is representative. It describes execution and locates deviations.
Outcome bias — A winning trade that breached the plan can reinforce a poor habit; a loss after a compliant decision can prompt abandonment of a reasonable rule. Evaluate the process first using information available at the time, then study aggregated outcomes separately.
Reviewing the plan
Adherence does not make a plan immutable. If costs, execution errors, changed market conditions, or unobservable rules emerge, suspend the rule and begin a documented review. Apply a revision from a stated date; rewriting the plan retrospectively destroys journal comparability.
Links
Sources
- CFTC — Forex Frauds — recommends a risk-management plan and links sticking to it with avoiding emotionally charged decisions; it does not promise success.
- FINRA — Investor Tips for Turbulent Markets — advises against impulsive decisions and points investors back to goals and a predetermined plan in turbulent markets.
- Gollwitzer and Sheeran (2006), Implementation intentions and goal achievement — peer-reviewed meta-analysis of if-then planning and turning intentions into action; not a financial-performance study.
- Baron and Hershey (1988), Outcome bias in decision evaluation — five experimental studies showing that outcomes can alter judgments of decision quality under uncertainty.
- Locke and Mann (2005), Professional trader discipline and trade disposition — peer-reviewed research operationalizing discipline through exit behavior in a specific sample of professional traders.
Proper use — Educational material, not financial advice. Adherence measures the stated process; it does not certify method quality or eliminate loss risk.