The Start Variance field contains the amount of time that represents the difference between a baseline start date of a task or assignment and its currently scheduled start date.
There are several categories of Start Variance fields.
Data Type Duration (duration field: A type of field whose content is expressed as a duration of time. Examples include the Work, Duration, and Delay fields. A duration field includes the duration unit, such as hour, day, or week.)
Start Variance (task field)
Start Variance (assignment field)
Entry Type Calculated (calculated field: A field in which the value is determined by Project based on information in other fields. Project may recalculate the value automatically or when you specify, depending on your choice of calculation settings.)
How Calculated The Start Variance field contains "0 days" until the scheduled start date varies from the baseline start date. Project then calculates the start variance as follows:
Start Variance = Start - Baseline Start
Best Uses Add the Start Variance field to the Task Usage view when you want to analyze whether your assignments are starting on, before, or after their planned start dates.
Example You set a baseline for your project three months ago and you now want to review the start variances on the assignments. You add the Start Variance field to the Task Usage view to analyze the assignment's progress and performance to date.
Remarks If the start variance is a negative number, the assignment is scheduled to start earlier than planned, as shown in the baseline. If the start variance is a positive number, the assignment is scheduled to start later than planned. If the start variance is zero, the assignment is scheduled to start exactly when planned.
You can set a baseline in the Set Baseline dialog box. This copies the current value for the scheduled Start field into the corresponding Baseline Start field.