Test Estimation Techniques
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Test estimation involves forecasting the time and costs required using techniques like function point analysis. It is important as underestimating can lead to budget overruns and delays. The key steps are: 1) Define functionality using use cases or test cases; 2) Assign weights to complexity; 3) Estimate effort per point; and 4) Calculate total effort. Allowing time for proper estimation, using past project data, and re-estimating throughout the project lifecycle can improve accuracy. Regular communication of assumptions and estimates is also important.
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This presentation was originally given at HP Discover 2012 (Las Vegas) on June 7th.
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- 6. Importance of Estimates Estimate too high Estimate too low Actual Schedule Estimated Schedule actual schedule = estimated schedule minimum actual schedule
- 9. Steps involved in Estimation Work out elapsed time / critical path Is the total reasonable Reassess tasks and / or effort Identify scope State assumptions Assess the tasks involved Estimate the effort for each task Calculate Total Effort No Yes Finish and Present the Estimate
- 16. Function Point Method - Example Medium Complex Simple Total Function Point Total 120 4.15 498 Weightage 1 3 5 Function Points 35 20 5 35 60 25 Estimate defined Per Function Point Total Estimated Effort( Person Hours)
Editor's Notes
- Estimating isn’t an exact science - there is no magic formula so that you can feed figures in and get a neat answer out - although there is some element of this, using tables of figures garnered from previous experience of a similar situation Estimating isn’t an Art either - in no way can it be seen as an abstract activity So, it is more like design - some “creativity” given the requirements, the situation, the time scales etc but working within a set of rules and using models to provide consistency, whilst having to make assumptions about some of the unknowns so that the rules can be obeyed
- KMMG was formed in 1987 with the merger of Peat Marwick International (PMI) and Klynveld Main Goerdeler (KMG) and their individual member firms. Spanning three centuries, the organization's history can be traced through the names of its principal founding members - whose initials form the name "KPMG." K stands for Klynveld. Piet Klynveld founded the accounting firm Klynveld Kraayenhof & Co. in Amsterdam in 1917. P is for Peat. William Barclay Peat founded the accounting firm William Barclay Peat & Co. in London in 1870. M stands for Marwick. James Marwick founded the accounting firm Marwick, Mitchell & Co. with Roger Mitchell in New York City in 1897. G is for Goerdeler. Dr. Reinhard Goerdeler was for many years chairman of Deutsche Treuhand-Gesellschaft and later chairman of KPMG. He is credited with laying much of the groundwork for the KMG merger.
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