Investigation methods research
Little accident investigation methods research (as contrasted with accident research on accident data) has been performed, and what has been done has not been well funded, or done with great formality, especially in the united states.
One research initiative has been under way for over 20 years. Its discoveries were routinely tested during actual investigations along each step of the way. As each finding emerged, it was tested and refined in the next subsequent investigation. When the work was applied, it helped resolve the problems just described.