Engineering and the Quiet Logic of Drawdowns
A drawdown is not a failure of the strategy. It is the strategy doing what it was supposed to do. Olga Magomedova on how an aircraft engineering mindset reframes the worst weeks of a trading year.
Failure modes, not failures
Engineers do not describe a system in terms of whether it works. They describe it in terms of the conditions under which it fails. The work is mostly about how the system fails, how quickly, and what other systems remain when it does. The same orientation makes drawdowns easier to read.
A trading strategy that has any expected edge will lose money for some period of time. That period is not a defect. It is the price of the periods when the edge pays. The trader who treats every drawdown as evidence of error is reading the wrong variable.
The two failures that actually matter
Two genuine failures exist. The first is a drawdown larger than the one the strategy was designed to produce. That is a signal. It usually means the position size was wrong, or the regime has changed in a way the strategy does not handle. The second is a drawdown that produces a different trader, one who deviates from the plan.
The first failure can be diagnosed in numbers. The second only shows up in behaviour.
Surviving the second failure
The trader who survives drawdowns intact is the one who treats the worst week as part of the design rather than as proof of inadequacy. Magomedova's working rule is that a drawdown is only a problem if it changes what you do tomorrow. If the size of yesterday's loss is making today's position larger, smaller, faster, or slower than the plan called for, the drawdown has won.
It isn't about bravado. It's about discipline, foresight, and the ability to stay calm under pressure.
What engineering teaches that finance forgets
There is one engineering habit worth borrowing in full. After any unexpected behaviour, an engineer writes a short post-mortem. What was observed, what was assumed, where the assumption was wrong, what changes. The artefact is more important than the conclusion. The act of writing it converts an emotion into a record that the trader can review when the next drawdown arrives.
The traders who keep these notes for several years do not feel less during drawdowns. They feel exactly the same. They simply have more evidence that the feeling is not predictive.
The plan that includes the worst week
The most useful version of a trading plan describes what to do during the worst expected week, including what to do with one's evenings and weekends. Reduce screen time. Stop reading commentary. Stay with the existing process. Resist the urge to redesign the strategy in the middle of the worst period it was designed to produce.
Build your independence before you need it.
The same principle applies inside the year, not just across years. A trader's independence in the worst week is built in the weeks before it. The plan, the rules, the sizing, and the post-mortems are all artefacts of preparation. The drawdown is when they pay.