80%
40%
20%
10%
8. Turtle
1
2
3
4
5
6
7
8
9
10
Units
25%
50%
75%
100%
100%
100%
100%
75%
50%
25%
Assignment contours work in the following manner:
n First, Microsoft Project takes the duration of a task and divides the assignment into 10 equal contour segments. This is done on a minute-by-minute level.
n Next, Microsoft Project applies Units to each contour segment per the contour’s definition as shown in the tables above. Remember, the contour definition tables show the percentage of the units a resource is assigned for a particular timephased segment in relationship to the units a resource is assigned to a task as a whole.
n The work for each contour segment is then calculated based on units and duration for the segment.
n Finally, the above figures are calculated for display in the timephased segment that is specified.
Understanding the definition of a contour and its basic functionality is important, but seeing how it really works when changes occur in a project is where we really begin to understand assignment contours. And to understand this, it’s important to remember the two levels of an assignment: the assignment level and the assignment timephased level. Because predefined contours, by definition, cannot be edited at the timephased level, we shall only look at the assignment level.
At the assignment level, making a change to duration, units, or work will cause a change in one of the other two variables, depending on the task type. This is accordance with the following equation:
Where D is duration, U is units, and W is work.
The changes that can occur when a variable is changed are reflected in the three tables below. Each table represents a task type as denoted in the upper left hand corner. The leftmost column shows the variable that is changed by the user. Each subsequent column shows status of the variable upon making the change. A changed variable is denoted by the Greek symbol delta (∆) that is generally used in mathematics as the symbol to denote change. When delta (∆) is followed by the variable’s first letter, it denotes the variable that has been changed by the user. When delta appears alone, it means that Microsoft Project has calculated that variable’s value based on the change by the user and the task type.
Fixed Duration Task
Duration
Units
Work
∆D
∆D
No Change
∆
∆U
No Change
∆U
∆
∆W
No Change
∆
∆W
Fixed Units Task
Duration
Units
Work
∆D
∆D
No Change
∆
∆U
∆
∆U
No Change
∆W
∆
No Change
∆W
Fixed Work Task
Duration
Units
Work
∆D
∆D
∆
No Change
∆U
∆
∆U
No Change
∆W
∆
No Change
∆W
At the assignment timephased level, there are three possible scenarios. These are reflected in the table below.
When this situation occurs…
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