Software Estimation Memo

Software Estimation Memo

Size, Effort Cost, Schedule, Staffing

- Productivity (Size/Efforts)
- Defect Density (Defects/size)
- Effort = Size/Productivity
- Productivity
  : 비슷한 productivity Values 참조, 이전 프로젝트 참조
  : Organization productivity 참조 (PPB)
  : Industry Productivity Rate
- Product Size : Cost and Effort -> Schedule -> Risk Assessment
- KLOC : Kilo Lines of Code
- FP : Function Points
- WBS : Work Breakdown Structure
- Estimation Model
  : Dev FP ; Enh FP : KLOC (Technology Centric Development)
  : Large FP > 1500 Pday : DE Model (DE Point) -> WBS concept (Agile Project)
                           Development and Enhancement Projects
- MR (Micro) < 4Pds, Minor 4~15 ; Major > 15

Data Function
- EIF : External Interface Files - Application 에만 참고 되고 Maintained 되지는 않음
- ILF : Internal Logical Files - Application 에 의해 Maintained 되는 파일들

Transactional Functions
- EI : External Inputs - 1개 이상의 ILE를 Maintain 하기 위함
- EO : External Outputs - 사용자에게 정보를 주기 위한 것 (로직의 결과물)
- EQ : External Inquiries - 사용자에게 정보를 주기 위한 것 (데이터 수정 후 제공)

- VAF : Value Adjustment Factor
- GSCs : General System Characteristics

- Large FP
  : Sub Application 들이 있음
  : Sub System Level FP counting

- KLOC
  : Development Project with less Functional Scope
  : Reengineering. Migration Projects
  : Technology Centric Development

- DE Model
  : Development and Enhancements Projects (FP/KLOC or DE Size Unit)
    Home Grown WBS concepts

* Maintenance Estimation Models

- FTE (Full Time Equivalences) - Maintenance and Prod. Support Proposal/Projects
- CP (Maint Model) : Small Maintenance : Micro MPs, GUI based. Use Post Data
- MR GUI : GUI Based Maintenance Request, Minor and Major MRs
- MR NGUI : Non GUI Based Maintenance Request, Minor and Major MRs
- PPM : Micro MRs and Production Support

* Test Estimation Methods
- Testable items (Manual Testing Method) : TC
- Test Automation

- RET : Recorded Element Type
- DET : Data Element Type. A unique user recognizable, non-repeated field
- FTR : File Type Reference. A FTR is ILF maintained, and EIF referenced

- DFP = (FP + CFP) * VAI
  DFP : Development Project FP counting
  FP : Adjusted FP Count for functions available after installation
  CFP : Conversion Unadjusted FP counting
  VAF : Value Adjustment Factor

- EFP = [(ADD+(HGA+CFP) * VAFA] + (DEL * VAFB)
  EFP : Enhancement Project FP Count
  ADD : Adjusted FP of functions added
  CHGA : Adjusted FP of functions changed
  CFP : Conversion adjusted FP counting
  VAFA : VAF of application after completion of enhancement project
  DEL : Adjusted FP of functions deleted
  VAFB : VAF of application before commencement of enhancement project

- 14 General System Characteristics
  1. Data Communications
  2. Distributed Data Processing
  3. Performance
  4. Heavily Used Configuration
  5. Transaction Rate
  6. Online Data Entry
  7. End-User Efficiency
  8. Online Update
  9. Complex Processing
  10. Reusability
  11. Installation Ease
  12. Operational Ease 
  13. Multiple Sites
  14. Facilitate Change