This is a learning process for rules. On the basis of basic principles, artificial intelligence identifies which are real rules and which are false. This may reveal some opportunities for arbitrage. But for computers, the difficulty often lies in the weight of rules and opportunities. So OneFin uses a method of imitating experts, selecting a group of experts in a field, copying their decision-making process, and importing a repeatable computing framework. While this is time consuming and labor intensive, expert systems can lead to coherent decisions that are more transparent and easier to understand.