Procedural task factors and performance decrement in automobile driving. Paper presented at Annual Meeting American Psychological Association, Symposium on primary task factors in performance decrement, Chicago, 6 September 1960.

In the general statement of the subject of the symposium and the accompanying analysis of task factors these have been broken down into variables of 1) the human himself, 2) the equipment, 3) the environment, and 4) the procedure. This symposium has been directed specifically at procedural task factors.