SIRF Rt has carried out a large number of benchmarking studies around the world and has had the privilege of visiting the best sites around Australia and New Zealand.
There seem to be different approaches to suit different problems and cultures and histories. However there is one common theme. The best sites all, in one way or another, work to identify and eliminate repeating faults.
Some use hierarchical approaches and some use informal methods. But all of the best, eliminate repeating defects in all their forms, which frees up resources to eliminate more. This is the high leverage approach to reliability.