Agile estimations types

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nagasowmya123
Participant
Posts: 73
Joined: Thu Feb 11, 2016 11:05 am

Agile estimations types

Is 3-point estimation is not a type of agile estimations? what it actually do?
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seema.sonkiya
Expert
Posts: 2306
Joined: Fri Jul 11, 2014 11:57 am

Re: Agile estimations types

Agile is about 4 values and 12 principles. It does not say anything about estimations. Anything we do, if align with these values and principles - we are following agile.

Story point estimations and Ideal days estimations are famous, so we use them when we are working in Agile environment. These are simple to use and Agile also says about simplicity.

In three point estimation, three values are produced based on prior experience or best-guesses:
1. Most Likely (M) --> Best Guess
2. Pessimistic (P) --> If the negative factors they identified do occur
3. Optimistic (O) -> If positive risks they identified do occur

Now the PERT formula is
E = (O + 4m + P ) / 6
seema.sonkiya
Expert
Posts: 2306
Joined: Fri Jul 11, 2014 11:57 am

Re: Agile estimations types

Agile is about 4 values and 12 principles. It does not say anything about estimations. Anything we do, if align with these values and principles - we are following agile.

Story point estimations and Ideal days estimations are famous, so we use them when we are working in Agile environment. These are simple to use and Agile also says about simplicity.

In three point estimation, three values are produced based on prior experience or best-guesses:
1. Most Likely (M) --> Best Guess
2. Pessimistic (P) --> If the negative factors they identified do occur
3. Optimistic (O) -> If positive risks they identified do occur

Now the PERT formula is
E = (O + 4m + P ) / 6

Agile never says not to use three point estimates. If it is needed in your environment, use it.