It is important to put the person being questioned at ease, and this can be done by explaining the purpose of the investigation ( to discover the causes so as to prevent a repetition). The witness will also relax if you encourage his or her participation and involvement in the exercise, by listening to any ideas he/she might have about possible preventive measures. An understanding and friendly manner is essential to obtain co-operation. Remember that the witness must be reassured that the purpose of the interview is not to blame anyone, but to try to find out the cause and so reduce the possibility of a recurrence. Interview Location Where possible, interviews should be carried out at the scene of the accident, because it is generally easier for those involved to explain themselves clearly with the 'props' close at hand and be able to point out specific thigs and recall their actions related to specific locations. Question P...