1. RET Rules One of the following rules applies when counting RETs:
Count a RET for each optional or mandatory subgroup of the ILF or EIF Or
If there are no subgroups, count the ILF or EIF as one RET.

2. Recap

3. Software Engineering II
Lecture 11
Fakhar Lodhi

4. Transactional Functions
External Inputs
An external input (EI) is an elementary process that processes data or control information that comes from outside the application boundary. The primary intent of an EI is to maintain one or more ILFs and/or to alter the behavior of the system.

5. Transactional Functions
External Outputs
An external output (EO) is an elementary process that sends data or control information outside the application boundary. The primary intent of an external output is to present information to a user through processing logic other than, or in addition to, the retrieval of data or control information . The processing logic must contain at least one mathematical formula or calculation, or create derived data. An external output may also maintain one or more ILFs and/or alter the behavior of the system.

6. Transactional Functions
External Inquiry
An external inquiry (EQ) is an elementary process that sends data or control information outside the application boundary. The primary intent of an external inquiry is to present information to a user through the retrieval of data or control information from an ILF or EIF. The processing logic contains no mathematical formulas or calculations, and creates no derived data. No ILF is maintained during the processing, nor is the behavior of the system altered.

7. Transactional Functions
Transactional Function Type EI EO EQ
Alter the behavior of the system PI M NA
Maintain one or more ILFs PI M NA
Present information to the user M PI PI

8. Complexity Matrix for ILFs and EIFs
RETs
DETs
1-19
20-50
≥ 51 1
Low
Low
Average
2-5
Low
Average
High
> 5
Average
High
High

9. Complexity Matrix for EIs
FTRs
DETs
1-4
5-15
≥ 16
< 2
Low
Low
Average 2
Low
Average
High
> 2
Average
High
High

10. Complexity Matrix for EOs and EQs
FTRs
DETs
1-5
6-19
≥ 20
< 2
Low
Low
Average
2-3
Low
Average
High
> 3
Average
High
High

11. FP Contribution of Different Analysis Components
Complexity
Low
Average
High
ILF 7 10 15
EIF 5 7 10 EI 3 4 6 EO 4 5 7 EQ 3 4 6

12. General System Characteristics
Data Communication
Distributed Data Processing
Performance
Heavily used configuration
Transaction Rate
On-line data entry
End-user efficiency
On-line update
Complex Processing
Reusability
Installation Ease
Operational Ease
Multiple sites
Facilitate change

13. Cumulative weight of General System Characteristics
Adjusted FP Count
Cumulative weight of General System Characteristics
Total Degree of Influence (TDI)
Can influence the FP count by ± 35%
Value Adjustment Factor (VAF)
VAF = (TDI * 0.01)
Adjusted FP Count (AFP)
AFP = UFP * VAF
TDI = 0
VAF = 0.65
AFP= UFP*0.65
TDI =70
VAF = 1.35
AFP= UFP*1.35

14. Complexity Matrix for ILFs and EIFs
RETs
DETs
1-19
20-50
≥ 51 1
2-5
> 5
Low
Average
High

15. Complexity Matrix for EOs and EQs
FTRs
DETs
1-5
6-19
≥ 20
< 2
2-3
> 3
Low
Average
High