Work From Task modelled permanent resources

Use this modelling type if you want the resource allocation to take its work from the task. If the task's work increases, the resource's work increases proportionally.

In order to use this modelling method, you must set the amount of work on the task to which the resource is allocated. You can do this in one of the following ways:

  • Right-click the task and select Properties to display the Bar and Task Properties dialog, click the Task tab, and record the amount of task work in the Task work and Work unit fields in the Effort & Modelling section.
  • Define a column in the spreadsheet that displays the Task Work field and enter the value in the column.
  1. Select Work From Task in the Modelling type field.
  2. Select a Calculated Parameter and Balancing Parameter from the Parameters group. The calculated parameter is the information that you want Powerproject to calculate; the balancing parameter is the information that you want Powerproject to change automatically if the task duration is amended in the bar chart. Setting a balancing parameter of None creates a fixed resource allocation that does not change if the task duration changes.
  3. Enter the amount of work that the resource performs for each unit of the task in the Work from task factor field. For example, in a project to refurbish a hotel, a Plasterer may have to plaster 50 square metres per room, so the work from task factor would be 50.
  4. Enter the work rate of the resource in the Work Rate field.
  5. Select the rate type that you want to use (Units Per Time Unit or Time Units Per Unit) in the Rate Type field.
  6. Enter the number of resources that you are allocating to the task in the Allocation field.
  7. Enter the duration for which the resource works in the Duration field.
  8. Select the Recalc work rate on assign check box to to specify that the balancing parameter (usually the Work Rate) of a Work From Task modelled resource should be recalculated when the resource is assigned to a task, or clear the check box to specify that the resource's calculated parameter (usually Allocation or Duration, but possibly Work Rate) should be calculated according to the task's duration.
  9. Either the Allocation or Duration field is disabled, depending on the selected calculated parameter.

For example, in a hotel refurbishment project, there is a Refurbish Bedrooms task. For each bedroom, you need a selection of permanent resources, including Plasterers. The Plasterers might plaster 50 square metres per room, at a work rate of 25 square metres per day. If there is 1 bedroom to refurbish, the Plasterer has to do 50 square metres of work; if there are 10 bedrooms, the Plasterer has to do 500 square metres of work. If the work on the Refurbish Bedrooms task is set to 10, the Work field automatically displays 500 (ie 10 rooms multiplied by 50 square metres of plastering). If you enter a work rate of 25 square metres per day and set the duration to 2 weeks, then choose Allocation as the calculated parameter, Powerproject calculates that 2 Plasterers are required to complete this amount of work in 2 weeks.

If you reduce the task duration from 2 weeks to 1 week, the resource allocation is adjusted according to the selected balancing parameter:

  • When Allocation is selected, the allocation of Plasterers increases from 2 to 4 so that the same amount of work can be completed in the time available.
  • When Work Rate is selected, the work rate of the Plasterers increases from 25 square metres per day to 50 square metres per day. The Plasterers must work faster to complete the work in the time available.

The Work from Task modelling method is useful if you have a combination of resources working together and they all have to work from the task's work. For example, the Refurbish Bedrooms task might require Plasterers, Painters and Carpet Fitters. You could model all three resources to work from the task, then put them all in an allocation group. When you assign the group to the task, each resource's work is calculated in proportion to the number of bedrooms being refurbished (the amount of work on the task).

Related Topics:

Questions you can answer by modelling resources

Non modelled permanent resources

Effort on Allocation modelled permanent resources

Work on Allocation modelled permanent resources

Effort Activity Budget modelled permanent resources

Modelling tasks in terms of task work without using resources