One “man-hour” is one hour of one worker. If one worker can pour one 1 m3 concrete in 15 hours, then 1 m3 can poured in 15 man-hours. Theoretically, with three workers working, one m3 conrete can be poured in five hours.
Spent Man-hour
Spent man-hour is the actual man-hour spent on site during the execution of any given activity.
Planned Unit Man-hour
“Planned unit man hour” is defined at the beginning of the Project, and provides the man-hours required to perform of one unit of any given activity.
Earned Man-hour
Earned man-hour the result of the formula where the actual installed quantity for any given time period for any given activity is multiplied by Planned Unit Man-hour. The Earned is used for progress calculations and shows the man-hour that would have been spent to install the “actual quantities” if the planned unit man-hour would have been the same as spent man-hour. Unit planned man-hour and site actual quantities are needed for calculation.
Planned Man-hour
Planned man-hour is the total man-hour for any given activity and it is the result of the multiplication of Planned Unit Man-hour by total quantity. If there is 10000 m3 concrete to be poured at the project, then the planned man-hour is 15 man-hours / m3, then planned man-hour for concrete works are 150.000 man-hours.