1. Estimates
in
Software Development/Testing
Lviv, 2013

2. Agenda
• Level Measurements
• Software Estimation Approaches
• Approximating size techniques
• Five Steps to Bottom-up Estimating
• Quality vs Scope/Cost/Time

3. Level Measurements
• Project-level measurements
• Phase-level measurements
• Activity-level measurements
• Task-level measurements

4. Project-level Measurement

5. Project-level Measurement
Types of Software development project requirements

6. Types of Software development
project requirements
Functional requirements
Nonfunctional requirements
Technical (build) requirements
All three types of project requirements
are necessary to produce a realistic estimate
of the total software project effort.

7. Functional project requirements
Functional size is the total size of all functional
requirements that are
 new
 renovated (changed)
 removed (deleted) from the software

8. Phase-level measurements
1. The requirements phase
2. The risk analysis phase
3. The design and specification phase
4. The coding phase
5. The integration and testing phase
6. The installation phase
7. The maintenance phase

9. Phase-level measurements
Testing phase
1. New function testing
2. Regression testing
3. Component testing
4. Integration testing
5. Stress testing
6. System testing

10. Project-, Phase-, and Activity-Level Estimating

11. Task-level measurements
Testing phase -> New function testing
1. Test Analysis
2. Test Design
3. Test Documentation
4. Review, Update
5. Test Execution
6. Bug Development
7. Test Results Validation
8. Test Reporting

12. Software Estimation Approaches
 Macro
 Equation Use
 Comparison
 Analogy
 Micro
 Work Breakdown

13. Comparison
Project Work Effort and Duration Estimates

14. Macro -/Micro – Estimation
Techniques
Where the macro- and micro-estimates vary by more than 10 to 15 percent,
you should identify why and rework your estimates.

15. Accuracy

16. Approximating size techniques
can be used when there is
insufficient opportunity, time, or perhaps information
to perform a detailed size measurement.

17. Approach to Estimates
Likely Effort for
Individual Project Activities
Te = (To + 4 Tm + Tp)/6
where
• Te = expected effort
• To = most optimistic estimate
• Tm = most likely estimate
• Tp = most pessimistic estimate

18. Valuable Estimates

19. Five Steps to
Bottom-up Estimating
• Identify All Project Required Tasks
• Estimate All Tasks Identified in Your WBS or Project Activity
Definition
• Identify Task Dependencies
• Identify the Resources Required to Complete All Tasks
• Determine When Resources Should Complete These Tasks

20. Quality vs Scope/Cost/Time

21. Thank you for Attention!
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