Hi Sandra, had to go through the code to jog my memory on this. I appologise in advance if its not all that clear.

Cancel Interval

A reminder is cancelled if its due date + the cancel interval <= to the date when you run the reminder generation.

E.g. If a reminder was due on 15/1/2008 and had a cancel interval of 2 years, it would be cancelled on any reminder run on or after 15/1/2010.

Sensitivity Interval

This is used to highlight reminders in the patient summary Reminders popup (the ringing bell icon).

The sensitivity interval is used to determine a lower and upper bound to compare reminder due dates with

i.e.

lower bound = current date - sensitivity interval
upper bound = current date + sensitivity interval

The lower and upper bound determines how the reminders are highlighted as follows:

Red (overdue) : If a reminder's due date is less than the lower bound
Yellow (remind): If a reminder's due date is less than the upper bound 
Green (normal): If a reminder's due date is greater than the upper bound

E.g:

       If the reminder due date was 30/9/1010 and the sensitvity interval was one month, it would be higlighted yellow given todays date (29/9/2010).

       If the reminder due date was 29/9/1010 and the sensitvity interval was one month, it would be higlighted red given todays date (29/9/2010).

       If the reminder due date was 30/10/1010 and the sensitvity interval was one month, it would be higlighted green given todays date (29/9/2010).

-Tim