Vector Vest, MetaStock, FastTrack, and other popular tdanirg software all suffer at the hands of users who over optimize their results. The more complex and the more often you tweak a tdanirg system, the more likely that you fit that system to a tdanirg history which is unlikely to continue.In 1999 FastTrack addressed that issue by withdrawing support for user promoted optimized tdanirg systems, offering, instead, simple basic strategies that are effective broadly. I am not sure what the other popular products have done to curb abuses.