Estimation Techniques (K2)

Question 1

Estimation based on ratios ?

Answer 1

Metrics-based technique. Figures are collected from previous projects within the organization - derive ‘standard’ ratios for similar projects. They are used to estimate the test effort for the new project.

Question 2

Extrapolation ?

Answer 2

Metrics-based technique. Measurements are made as early as possible in the current project to gather the data. Extrapolating data after observation to calculate the effort required.

Question 3

Wideband Delphi ?

Answer 3

Expert-based technique. Experts make experience-based estimations.
Each expert estimates the effort isolation. Results collected - if there are deviations experts discuss their current estimates. New estimations done based on that feedback. Rinse and repeat until consensus.

Question 4

Three-point estimation ?

Answer 4

Expert-based technique. Three estimations are made by the experts: the
most optimistic estimation (a), the most likely estimation (m) and the most pessimistic estimation (b). The
final estimate (E) is their weighted arithmetic mean.

E = (a + 4*m + b) / 6.