Project Estimations | Komputasi | Suatu Permulaan

J.E.D.I

7.7 Project Estimations

Project estimations are necessary to help software engineers determine the effort and cost required in building the software. To do estimation, it would require experience, access to good historical data, and commitment to quantitative measures when qualitative data are all that exists. One can use LOC and LP to provide cost and effort estimates. They provide estimate variables to “size” each element of the software. They provide a baseline metrics collected from past projects and used in conjunction with estimation variables to develop cost and effort projections. As an example, consider the project estimates for the club membership maintenance system. To use LOC and FP to determine the cost and effort estimate, we computer first the FP. Information Domain 3 Weighting Factor 4 Measurement Parameter 5 Co unt 6 Simpl e Average Complex 7 Number of User Inputs 8 2 9 x 3 4 6 6 10 Number of User Outputs 11 5 12 x 4 5 7 20 13 Number of User Inquiries 14 3 15 x 3 4 6 9 16 Number of Files 17 2 18 x 7 10 15 14 19 Number of External Interfaces 20 2 21 x 5 7 10 10 Count-Total 59 1. Does the system require reliable backup and recovery? 3 2. Are data communications required? 3 3. Are there distributed processing functions? 1 4. Is performance critical? 2 5. Will the system run in an existing, heavily utilized operational environment? 3 6. Does the system require on-line data entry? 4 7. Does the on-line data entry require the input transaction to be built over multiple screens or operations? 2 8. Are the master files updated on-line? 2 9. Are the inputs, outputs, files, or inquiries complex? 1 10. Is the internal processing complex? 1 11. Is the code designed to be reusable? 4 12. Are conversion and installation included in the design? 3 13. Is the system designed for multiple installations in different organizations? 1 14. Is the application designed to facilitate change and ease of use by the user? 1 Total= 31 Software Engineering 324 J.E.D.I FP = 59 X [0.65 + 0.01 x 31] = 56.64 FP The project heavily uses JAVA. The estimated LOC is computed as follows: LOC = 56.64 63 = 3568.32 LOC Derived Estimates: Assume that the Club Membership Maintenance is similar to Project Four. Cost Estimates are computed as follows: Cost of Producing a single LOC From the Database: KLOC Cost CostKLOC = P30,00015,000LOC = P2.00LOC Cost of the project = 3568.32 2.00 = P7136.64 Effort Estimates are computed as follows: Number of LOC produced in a month From the Database: KLOCEffort KLOCEffort = 15,000LOC 8 months = 1875 LOC month Effort of the project = 3568.32 1875 = 1.9 or 2 months Software Engineering 325 J.E.D.I

7.8 Writing the Project Plan