Assessing the Value Adjustment Factor

NOTE: Assessing the VAF and using Adjusted function points is no longer recommended in IFPUG CPM 4.3 , nor is it used by the ISBSG group when reporting functional size. It is highly recommended that if your organisation is using Adjusted Function Points for size that they review this strategy to comply with the ISO standards on functional size.

This can be optionally used to record the features of the software and adjusts the Functional Size to a delivered product size.

When the main screen is displaying the hierarchy trees for a particular Release select File – Adjustment Factor from the main menu. The General Characteristics (GSCs) will display as defined in IFPUG 4.3. These have a default rating of ‘3’ (for average influence) and the Rating check box will be empty. Highlight the General Systems Characteristic that you want to rate and select the appropriate rating number from 0 to 5. As soon as you move the rating from 3 to another value the GSC is recorded as having been rated and the check box will be ticked.

If you rate any single GSC then the VAF will be calculated assuming the other non-rated GSCs to have a value of ‘3’.

If you do not select to rate any GSC then the VAF will default to the Industry average default value of 1.00.

Value Adjustment Factor reports will highlight when the VAF or GSCs have assumed a default value.

To Report the Value Adjustment Factor - From the main menu select File – Report Selection – Others – Value Adjustment Factor. (sSee Other Reports).

The Value Adjustment Factor can be imported and exported between Releases within the same or different Applications and/ or SCOPE databases.

Note: The Value Adjustment Factor is an optional step in the IFPUG 4.3 and the IFPUG ISO standard for Functional Sizing. The Unadjusted function point count is the ISO/IEC 14143-1 compliant functional size.