A method for an electronic calendar and scheduling application to associate levels of availability (bookability) with time slots on individual calendars for minimizing the level of intrusiveness during the scheduling of a meeting includes: determining a set of feasible time slots bounded by a time range; determining a time slot with the lowest level of intrusiveness for one or more potential participants by: determining a level of intrusiveness in a time slot by: assigning a first weight based on a participant's attendance level to the meeting; assigning a second weight based on a participant's booking availability priority; performing a mathematical calculation with the first weight and second weight to obtain a calculated value; storing the calculated value; obtaining additional calculated values for additional participants; and wherein in the event there are no more additional participants: performing a mathematical combination of the stored calculated values to obtain an intrusiveness value.