A split-half search is a technique for systematically isolating the source of an issue. You start by eliminating roughly half of the items you are checking, then trying to re-create the issue. You continue halving your search group until you find the source of the issue. A split-half search requires applying your knowledge of the product, its common issues, and the symptoms as you check one possible cause after another, in a logical order.
This part of the troubleshooting process can be the most difficult and the most time-consuming. That's why a logical and methodical plan is so important. We've found that the following order has been effective:
User errors. Check for user errors in the course of gathering information, ...