Accession Number : ADP001152

Title :   A Study of Task Difficulty with a Subjective Rating Scale,


Personal Author(s) : Repperger,D. W. ; Rogers,D. B. ; Van Patten,R. E. ; Frazier,J.

Report Date : MAY 1982

Pagination or Media Count : 17

Abstract : The results of two experiments are discussed which relate to task difficulty and the effects of environmental stress on tracking performance. The first experiment involved 5 different sum of sine tracking tasks which humans tracked both in a static condition and under a 5 Gz acceleration stress condition. The tasks were designed in such a manner as to investigate workload measures and to compare our hypothetical design to subjective evaluations. The tasks were required to satisfy 5 criteria specified in mathematical terms. The second experiment involved similar environmental stress conditions but in this case the tasks were constructed from deterministic functions with specially designed velocity and acceleration profiles. In both parts of this experiment, subjective evaluations were obtained and compared to the assumption that difficulty is related to magnitudes of velocity and acceleration profiles of the target tracking task. Phase Plane performance analysis was conducted across 7 subjects to study potential measures of workload or tracking.

Descriptors :   *Pilots, *Workload, *Performance(Human), *Tracking, Stress(Physiology), Stress(Psychology), Ratings, Measurement, Automatic pilots, Man machine systems, Questionnaires, Data acquisition, Correlation techniques, Statistical analysis, Psychophysiology, Workshops

Distribution Statement : APPROVED FOR PUBLIC RELEASE