The Productivity Report gives information about each of the five possible
methods for each of BIG's nine activities. The following is given for each activity:
- Method Name: Name of the method.
- Productivity: Method's productivity rate in construction units per hour (CU/hr).
Each hour this method is used, the specified number of CUs will be completed.
- Labor Cost: The cost of the labor needed to complete one CU ($/CU).
- Materials Cost: The cost of the materials needed to complete one CU ($/CU).
- Subcontractor Cost: The agreed upon cost per CU if this method is subcontracted. Typically,
self-performed methods will have a labor and material cost associated with
each CU and subcontracted methods will have a subcontractor cost associated
with each CU. Methods normally will not have both a subcontractor cost and labor & materials costs.
- Uncertainty Range: The range of uncertainty affects the cost of labor and materials for every job in every
period. When jobs are worked, the labor and materials costs for the method you choose will be
the amount listed in the report (possibly modified by labor or materials indices) plus or
minus some percentage from the uncertainty range. For example, for "Excavation1" in the
sample Productivity Report shown below, the actual labor cost per CU when the
method is used will be $11 plus or minus 5%. So, the actual labor cost per CU could be $10, $11, or $12.
There is no uncertainty to subcontractor costs because in reality these costs
would be agreed upon in a contract.
- Weather Sensitivity:
A method's weather sensitivity may be one of:
The temperature affects the productivity (CU/hr), and rainfall affects the number of worked
days in a period.
- None = the method is not sensitive to changes in the weather.
- Temperature = sensitive to temperature.
- Precipitation = sensitive to rainfall.
- Both = sensitive to both temperature and rainfall.
- Method type: There are two types of methods: self-performed and subcontracted. Self-performed
methods are those where the work is performed by your company directly. Subcontracted
methods are those where your company hires a subcontracter to perform the work. In
reality a contract would be negotiated between your company and a subcontractor. In BIG
this process is simplified so that subcontracted methods may be selected the same as normal methods.
Besides labor and materials vs. subcontractor costs, there are several key differences between
subcontracted and self-performed methods that will be discussed later in this manual.
The total cost per CU for a self-performed method can be calculated by adding together the
labor and material costs. The total cost per CU for a subcontracted method is the same as
the subcontractor cost. The total cost per hour can be calculated by multiplying the
productivity (in CU/hour) by the total cost(in $/CU).
Example: For a self-performed method, the Productivity is 10 CU/hour. The labor cost is
$12/CU and the materials cost is $5/CU.
To find the cost per hour, first add the labor and
materials costs to compute the total cost per CU: $12/CU + $5/CU = $17/CU.
Next, multiply the total cost by the productivity to get the cost per hour:
$17/CU * 10 CU/hour = $170/hour.
TIP: Keeping track of the units will help you with these calculations.
As a regular practice you will not be required to use the raw numbers given on the Productivity
Report very often. Instead, you will receive an Estimated Time and Cost Report
that has been prepared for you for each job available for bid.
To access the Productivity Report, select "Productivity Report" on the Main Menu.