I'd like to start a thread on manual backtesting. To start things off let me ask a few questions to get some discussion going. Do you find manual backtesting useful, and if so what are some of the ways this has been helpful? What is the best way you have found to do manual backtesting? What process do you go through to make manual backtesting as objective as possible? Are there any pitfalls of manual backtesting that others should be aware of? How do manual backtesting and computerized backtesting compare with regards to insights learned about the market's character, new patterns found, robustness of the systems tested, and overall productivity for testing a data series? Thanks for your comments and responses on this topic.