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3 Point And PERT Estimation Technique In Agile

In this article, we will discuss the following estimation techniques in agile.

Scenario

Let us consider a scenario where you have a requirement of a login screen. You discuss with the team and ask the following questions.

Let us abbreviate three questions as Normal (N), Optimistic (O) and Pessimistic (P).

Let us make a table.

Normal(N)	Optimistic (O)	Pessimistic (P)	Estimation formula	Estimated hours
16	12	30	(N + O + P)/3	(16 + 12 + 30)/3 = 19 hours.

PERT stands for Program (or Project) Evaluation and Review Technique. Here is the table for PERT estimation.

Normal(N)	Optimistic (O)	Pessimistic (P)	Estimation formula	Estimated hours
16	12	30	(4N + O + P)/6	(64 + 12 + 30)/3 = 18 hours.

Standard deviation shows the boundary on either side of the mean.

Normal(N)	Optimistic (O)	Pessimistic (P)	Standard Deviation (Formula)	Standard Deviation
16	12	30	(P - O)/3	(30-12)/3 = 6 hours
16	12	30	(P - O)/6	(30-12)/6 = 3 hours

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