ABSTRACT
Calendar time is the time with which we are most familiar. Simply stated, it’s the time on the clock, without any adjustments for the type of work or time that’s being applied. We are well acquainted with this concept by looking at a calendar or clock. Organizations that manage purchasing and procurement often use working days to account for waiting time, whereas project organizations sometimes apply elapsed days for the time between the original start date and the anticipated date of delivery. Sometimes there are considerations where a task will have working time, but the lag applied to it is calculated in elapsed time. Time is also relevant to our earlier discussion on the notions of availability and productivity in estimating. Rather than being expressed as hourly or daily costs, however, these concepts are addressed in schedules and networks as hours or days.
