Date of Award


Document Type

Independent Study

Degree Name

Master of Science (MS)




Since the events of September 11, this country has continued to grow and its commercial air travel along with it. As the number of passengers and planes increase, so must the skill and etermination of the air traffic controllers. They must be at their peak performance levels to ensure the flying public is handled safely and expeditiously. This study looks at the possible effects of the time of day. After defining time of day effects and giving some of the consequences of these effects, a look into the task of a controller was necessary. This study broke the task down to concentration and memory as the two most important aspects. These were examined and numerous examples were found that indicated it was possible for the time of day to have a negative effect. As there is little research on this very topic in aviation, it is clear that it is necessary. An answer may be found that can neutralize these effects and improve safety overall.