Paper trading: what a simulation can test, and what it misses
A simulated account can expose operational mistakes before money is committed. It can show whether you selected the wrong ticker, misunderstood an order or failed to record an exit. A positive simulated balance alone does not establish that the same results are executable with real money.
Test the mechanics deliberately
Practise a limit order, cancellation and partial fill. Check how the simulator treats each. Some systems fill at displayed prices without reproducing queue priority or available quantity. Read its assumptions before trusting the execution record.
Add realistic hypothetical costs. If a simulated round trip gains $8 but omitted costs would total $10, the displayed profit changes sign. Keep gross and net figures separate.
Write the plan before the outcome
Save the entry reason, planned holding period and conditions for leaving. If you use TC2000, save the chart alongside the entry note in your TC2000 workspace. Editing the note after a profitable move removes the evidence of what you originally knew.
Run the exercise during ordinary sessions, including days when no opportunity fits. A simulation that permits endless retries or excludes losing attempts is testing your editing skills.
Money also changes behaviour. Losing a virtual $500 and losing money needed for a bill do not create the same pressure. A rehearsal cannot prove that you will follow the plan under that pressure.
Finish each session with a short operational audit: correct instrument, correct quantity, recorded status, costs included and complete journal. Keep a list of errors that occurred repeatedly. Those are concrete problems the simulation can help you fix.