Characteristics of Value Adjustment Factor(VAF) in Function Point Analysis

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• Nirja Shah   -Posted on 05 Oct 15
  - The value adjustment factor (VAF) is based on 14 general system characteristics (GSC's) that rate the general functionality of the application being counted.
  
  - The degrees of influence range on a scale of zero to five, from no influence to strong influence.
  
  - The characteristics are as follows:
  
  1. Data communications - How many communication facilities are there to aid in the transfer or exchange of information with the application or system?
  
  2. Distributed data processing - How are distributed data and processing functions handled?
  
  3. Performance - Was response time or throughput required by the user?
  
  4. Heavily used configuration - How heavily used is the current hardware platform where the application will be executed?
  
  5. Transaction rate - How frequently are transactions executed daily, weekly, monthly, etc.?
  
  6. On-Line data entry - What percentage of the information is entered On-Line?
  
  7. End-user efficiency - Was the application designed for end-user efficiency?
  
  8. On-Line update - How many ILF’s are updated by On-Line transaction?
  
  9. Complex processing - Does the application have extensive logical or mathematical processing?
  
  10. Reusability - Was the application developed to meet one or many user’s needs?
  
  11. Installation ease - How difficult is conversion and installation?
  
  12. Operational ease - How effective and/or automated are start-up, back-up, and recovery procedures?
  
  13. Multiple sites - Was the application specifically designed, developed, and supported to be installed at multiple sites for multiple organizations?
  
  14. Facilitate change - Was the application specifically designed, developed, and supported to facilitate change?

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