ISTQB FOUNDATION 4.0 | Tutorial 47 | Test Estimation Techniques | Wide Band Delphi | Extrapolation

[@reenvillafuerte2333]

Sir can you confirm if I understand correctly: 1. Both the metric-based techniques uses the previous/historical data to estimate the effort for the current and future projects, only difference is the approach on both... where the 'Estimation by ratio' uses the ratio and proportions on similar project (thinking that test will be same ratio to new project); while the 'Extrapolation' uses the different series of trends/patterns/defect rates/execution rates and other past project data (defining how team performs in the past). 2. One of the main difference of Wideband Delphi to Poker Planning is the anonymity of the estimation process, the Wideband Delphi estimation is done in isolation which means no one knows who guessed that estimate and takes their estimation on their own time, only time they will know is if there are differences on estimates and each experts needs to discuss it... while the Poker Planning, everyone sits together and uses cards that everyone will show their own card as a vote of their estimates, hence its a quicker/faster discussion. -- I think this is more aligned on what you said now.. I repeated the video. :D

[@TMSQUARETECH]

Indeed correct.

[@owenbitowski7572]

Are we expected to learn the 3 point estimation formulas as part of the syllabus/ exam?

[@TMSQUARETECH]

Yes for sure.

[@princesskaur5777]

Hello sir !! can you please share formula for Extrapolation… I find question on that .. I can’t solve it … TIA

[@DiegoFernando-qw6lc]

What is the meaning of 3:2? I didn't understand that part very well

[@TMSQUARETECH]

3:2 is about a ratio. In simple words if you have 10 items and you want divide in two half(which is 5 and 5) we say 1:1 but if want to share 6 and 4 then we say 3:2 as 3 parts is 6 and 2 parts is 4

[@JasOlympicMatt]

in the formula where does the 4 and 6 come from

[@miguelvalleaguilar7891]

Three-point estimation is part of "Expert Based Estimation" so data like A, M, and B come from experience. Values of 4 and 6 are part of the formula as coefficients