Product Backlog Item's estimates?

Last post 05:26 am March 19, 2014
by Justin Todd
6 replies
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06:44 am November 27, 2013

I got a little doubt over Product Backlog Item's estimates. I read somewhere that the DT is responsible for all the estmations but the PB items are created by the PO and Product Backlog items have the attributes of a description, order, estimate and value.
So who create the estimations for PBI:
(1) PO discussing with DT
(2) DT only
5) DT along with PO after understanding the PBI

08:46 am November 27, 2013

None of those options. Responsibility for making estimates lies wholly with the DT but only after discussing the PBI with the PO.

04:42 am March 10, 2014

In page 13 of scrum guide: "The Development Team is responsible for all estimates. The Product Owner may influence the Development Team by helping it understand and select trade-offs, but the people who will perform the work make the final estimate."
So I think "2. DT only" is correct option.

12:22 am March 11, 2014

From what I understand the PBI's are given an estimation in story points during product backlog grooming and sprint planning sessions. These are just an estimate of size. The DT will then create tasks for each selected PBI and these tasks will then get time based estimates.

05:28 pm March 17, 2014

Posted By Justin on 11 Mar 2014 12:22 AM
From what I understand the PBI's are given an estimation in story points during product backlog grooming and sprint planning sessions. These are just an estimate of size. The DT will then create tasks for each selected PBI and these tasks will then get time based estimates.

When estimate PBI's during the Sprint Planning the PO can't use the estimation as input to order the Product Backlog. I read that the DT can use 10% of time for refinement and estimate the Backlog.

05:38 pm March 17, 2014

I have a related question.

We have two development teams and one product backlog. What’s best practice for refinement and estimate the backlog? Is it possible that team A do the refinement and estimation of a few PBI’s and that team B put these PBI’s on their Sprint Backlog?

When that’s possible than in my opinion it’s also possible that refinement and estimation is done by a part of the development team instead of the whole team. But I understand that is not recommended.

05:26 am March 19, 2014

Posted By Franck van der Sluijs on 17 Mar 2014 05:28 PM

Posted By Justin on 11 Mar 2014 12:22 AM
From what I understand the PBI's are given an estimation in story points during product backlog grooming and sprint planning sessions. These are just an estimate of size. The DT will then create tasks for each selected PBI and these tasks will then get time based estimates.

When estimate PBI's during the Sprint Planning the PO can't use the estimation as input to order the Product Backlog. I read that the DT can use 10% of time for refinement and estimate the Backlog.

Correct. The backlog will be ordered in terms of value by the PO. The DT will then choose which tasks to put into the Sprint Backlog, considering the PO's priority order. The DT will try and do as many of the top items it can fit into the sprint, but can select lower priority items if they need to fill a small gap in the sprint backlog.