*Most investors do not know whether their approach is working, because they have never defined what working would look like or what evidence would show that it was not.*
An investor who has chosen a style and practised it for several years faces a question they usually cannot answer: is it working? The difficulty is not that the information is unavailable but that they have never established what working would mean. Without a definition, they fall back on the crudest available signal, which is whether their portfolio has risen, and that signal tells them almost nothing about the quality of what they are doing.
The first requirement is a comparison, and it must be an honest one. A portfolio that has gained a certain amount over three years has done well or badly only in relation to some alternative, and the relevant alternative is what the investor would have earned had they done something simpler. For most, this means a broad, low-cost holding of the whole market. If an investor's active approach, after all costs and all effort, has not exceeded what they would have earned by owning everything and doing nothing, then the effort has not been rewarded. This comparison is unwelcome and it is the only one that matters.
The second requirement is an appropriate timeframe, and here investors err in both directions. Evaluating a long-horizon style over one year is meaningless, because a year contains far too much variance for any conclusion to be drawn from it. But refusing ever to evaluate, on the grounds that the horizon is long, is simply an excuse that shields the investor from evidence. A reasonable practice is to review the reasoning behind decisions frequently and the results of those decisions rarely, over periods long enough that the outcome carries some information rather than merely noise.
The third and most important distinction is between the quality of decisions and the quality of outcomes, and it is the one almost nobody makes. A sound decision can produce a poor result, because the future is uncertain and even well-reasoned judgements sometimes fail. A poor decision can produce a good result, through luck. An investor who evaluates only outcomes will learn the wrong lessons in both cases, congratulating themselves for a reckless position that happened to succeed and abandoning a sound method that happened to disappoint. Over many decisions, the two tend to converge, but over any short run they can diverge completely.
This suggests that the most valuable evaluation an investor can perform is not of their returns but of their conduct. Did each decision flow from the stated framework, or was it improvised? Were the positions entered for the reasons the framework specifies, and exited for the reasons it specifies? Was there drift, and if so in which direction? These questions can be answered honestly by anyone who has kept a record, and their answers reveal far more about whether a style is being practised than any return figure does. A style cannot be evaluated if it is not actually being followed, and most are not.
Keeping such a record requires writing down the reasoning at the time a decision is made, before its outcome is known. This is uncomfortable, which is why so few do it, and it is uncomfortable precisely because it works. Reasoning recorded in advance cannot be revised after the fact, and it therefore exposes the investor to an honest account of what they actually believed rather than what they later remember believing. Memory is an unreliable witness in this domain, and it reliably distorts in the direction that flatters.
A further consideration is what an investor should conclude from a genuinely disappointing period, once the record has been examined honestly. If the decisions flowed from the framework, and the framework's reasoning remains sound, then a poor stretch may be simply the ordinary cost of the method, and the appropriate response is to continue. If the decisions did not flow from the framework, then the poor result says nothing about the framework at all, because the framework was not tested. And if the reasoning behind the framework itself has been shown to be mistaken, then reconsideration is warranted. Three quite different situations, easily confused, and only a record can distinguish them.
The most common failure is to skip this analysis entirely and to respond to a disappointing period by changing approach, which guarantees that no framework is ever held long enough to be evaluated. An investor who changes style every three years has not tested three styles. They have tested nothing, and they have accumulated the transition costs of each change while learning almost nothing from any of them.
It should be acknowledged that this kind of honest evaluation is genuinely unpleasant, and that its unpleasantness is the main reason it is so rarely performed. An investor who examines their record faithfully may discover that years of research, attention, and conviction produced nothing that a simple, cheap, unattended holding would not have produced on its own. This is a deflating finding and there is no way to make it comfortable. But it is also enormously valuable, and it is available at no cost beyond the willingness to look. The investor who learns this about themselves can redirect their effort toward something that actually rewards it, or can simplify their approach and reclaim the time and attention the effort consumed. The investor who never looks continues indefinitely, paying the costs of activity without ever establishing whether the activity earns them.
At VESTFY™ the emphasis on process over outcome reflects a straightforward conviction: that an investor can control their conduct and cannot control their results, and that judging themselves by the thing they cannot control produces neither improvement nor peace. The investor who reviews their own decisions honestly, against a framework they wrote down in advance, is doing the one form of evaluation that can actually make them better.