The most common, serious fault in cause trees is the tendency to blame people rather than push on to find the real root cause. The remedy is to use an understanding of human factors, but most investigators struggle with this. Here are two solutions.
The 5WHYS process, made famous by Toyota, provides an incredibly easy and powerful technique for "first responders" to deal with problems. People close to the issue, seeing first hand the symptoms, gather invaluable information that is too often lost. Luckily, modern phones and tablets provide a solution.
Problems come in all shapes and sizes. Obviously it would be too expensive to apply the most complex solution process to every problem. It is best to start with a simple process and escalate if needed and if justified. This article presents a simple approach to bring it all together which minimises cost while maximising outcomes for the organisation and personnel.