Disclosure of approach and Longevity

Now An undisclosed approach is called a "black box" system. You need a lot of faith to use a system that doesn't state how it works. It is preferable to go for a system that provides some information on the approach used a system that has been around for a while, and has been reviewed and checked out by a number of people (who are not selling it) is preferable to the new kid on the block. Many trading systems spring up, and then quietly disappear once word gets around that they don't work.