Something is seriously wrong if these basic items are missed. By 3 people.
we've heard this over and over ad nauseum for the last few hundred posts and it doesn't provide any closure on this accident cause while wasting a good deal of bandwidth in this thread.
give it a rest
The only thing that is worth while discussing are the methods available to mimimize missing of the basic items by the human. That has been discussed as well but is still open for positive contributions from knowledgeable folks