The key to focusing more on process is to understand that good outcomes follow good processes. Without understanding the underlying process, good outcomes could just as likely be due to dumb luck as to skill.
You should be reminded of this every time you read the disclaimer "past performance is no guarantee of future results." What you are actually seeing is an admission of random outcomes. When past performance is the result of luck, then it provides zero insight into what future results might look like.
-Barry Ritholtz, How Not To Invest: The Ideas, Numbers, and Behaviors That Destroy Wealth—And How To Avoid Them
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