THE PAPER IS CONCERNED WITH THE EMPIRICAL INVESTIGATION OF DAY-TO-DAY VARIABILITY FOR DISCRETIONARY TRIPS INCLUDING SHOPPING AND PERSONAL BUSINESS BASED ON A SEVEN DAYS' CONSECUTIVE ACTIVITY DIARY DATA COLLECTED IN UTSUNOMIYA, 1988. THE DAY-TO-DAY VARIABILITY OF THESE TRIPS WAS SIGNIFICANT EVEN ON WEEKDAYS (MON-FRI) AS COMPARED WITH THAT OF WORK TRIPS. TRIP LENGTH AND ACTIVITY DURATION TIME INDICATED DIFFERENT VARIABILITIES FROM AVERAGE NUMBER OF DAILY TRIPS, AND HOUR-TO-HOUR TRIP FREQUENCY WAS ALSO FOUND VARIABLE ON WEEKDAYS. TRAVEL MODES MADE THE ACTIVITY LOCATION SIGNIFICANTLY DIFFERENT, WHILE ANY DEFINITE DIFFERENCE IN ACTIVITY LOCATION COULD NOT BE SEEN BETWEEN WEEKDAYS AND WEEKEND. INTERACTION BETWEEN THE DAY OF THE WEEK AND TRAVEL ATTRIBUTES SUCH AS TRAVEL MODES AND TIME OF THE DAY WAS STATISTICALLY SIGNIFICANT OVER SEVEN DAYS, BUT NOT OVER FIVE WEEKDAYS.
