I am planning to start option strategy trading soon. But the option exercise assignment bothers me a lot. I can't put the option assignment into my strategy trading model. Once the option gets assigned, most likely my broker will liquidate my account. Even if the broker does not liquidate my account when I have enough fund/margin, the strategy trading model is with broken legs and won't be able to work properly. As a non-full time trader, I don't monitor the account every day. The unexpected option exercise assignment may ruin all of the profit because the strategy trading usually has small margin. Do you have any experience or idea what to do here? I heard that the assignment would be 1%. Is 1% of the option orders or 1% of the option contracts? If one of the option order gets assgined, will all contracts of the order be assigned or possibly partially assigned? At what circustance the order will have better chance to be assigned? Thanks for sharing your story. For a big strategy, it may involves dozens of orders. Let's say 50 spreads and 2 months holding. If each order has average 10 contracts, it would be 1000 contracts in two months and 600 orders (6000 contracts) in a year. If assignment is 1% then the assignment is almost unavoidable. (There is no big difference when there are half of the orders are option shorts). If I don't have any good solutions, the only thing I can do is leaving the US options along and dealing with Euroupean options instead. Appreciate your idea and inputs.