Use secondary proportionality when you have a definite correspondence between work packages in project progress and can apportion the effort accordingly.

You must maintain a base object for the WBS element or activity.

You can do this using the Project Builder, the project planning board, or structure planning. The procedure is the same in all three.

Select an project object and choose
This brings up the Change WBS Element dialog box, where you choose Reference object.

In this measurement technique, the degree to which a WBS element or activity is finished is dependent upon the progress of another WBS element or another activity. You can use weighting to fix the relationship between the activities.

In a network there are two activities, "Create drawings" and "Check drawings". A drawing is only complete once it has been checked.

The POC of the activity "Check drawings" will be copied from the activity "Create drawings" when you use this measurement technique. You use milestones as the measurement method for activity 1, "Check drawings".